Over the years, the Longest Johns and their community have gained a fair few injokes and memes. Here are explanations of some of the more enduring ones, in alphabetical order for easy navigation:
Adequate: During a livestream on the 22nd of January 2019, the band referred to a song they did as being "adequate". Chat picked it up and started saying "Adequate" after every song to say that it was great. It later turned into a subscriber emote at both YouTube and Twitch.
Benas: A misspelling of the word "beans" during a game of Jackbox in late April 2020. It became the replacement word for "beans", and occasionally for "bones" in the song title Bones in the Ocean.
Father Buckitt: Father Buckitt is a returning RPG character created and played by JD. He made his first appearance in their livestreams of Divinity: Original Sin II starting in late March 2019, and later returned as a character in the currently ongoing D&D livestreams. The other characters from D:OSII deserve honourable mentions too, since the name "Jeff Specifically" is still uttered from time to time, and "Jingleheimer the [...]" had its own counter, for every time Jingleheimer the IV died.
Full Salonika: This phrase originated during a live gig (of which no video evidence has yet surfaced), when Robbie, allegedly having consumed a few too many delicious beverages, attempted to lead their rendition of Salonika, but kept starting the song in too high a key and forgot the lyrics several times. The phrase "going full Salonika" became slang among the band members for royally screwing something up. After they told the story on a livestream, the community also picked up the phrase. It can be viewed as the opposite of "adequate".
Good timezone: Good timezone is a timezone neutral greeting. Because "good morning" may be morning for the one typing it, but not for the people who are in a different timezone. It was first used in February 2020 but got more frequent use since August/September that year.
Goongith: From the same stream that gave rise to Thirty Birds, we got Goongith, which was a misspelling of "goodnight". It is now used for both "goodnight" and as a general farewell.
Hype cow: In one of the vlogs, Dave at one point deadpans, "I'm the hype cow. Moooooooo." The community quickly picked up on the phrase, and the Hype Cow later became the hype emote for YouTube and Twitch.
Kwaken...: Anything related to Kwakens is related to the Longest Johns "mascot", the Kwaken. It became a subscriber emote on Twitch on the 27th of February 2019. Since then it has been incorporated into some other expressions/words like the much used "kwakenhug".
Nailed it: Nailed it existed before the Longest Johns started streaming, and is not specific to the band or its community, but it was adopted quite readily. It is used to express approval or satisfaction at a job well done, or more commonly, to jokingly acknowledge something not at all well done. It was more in use in the early days of livestreaming, but still present as a subscriber emote at both YouTube and Twitch.
Octenth: Octenth or October tenth or any variation of that originates from a Sea of Thieves singing stream on Twitch, where the Longest Johns had been singing to another crew who typed "10/10" in Sea of Thieves. It was spoken by the text to speech as "October tenth" and now that is known as another way of saying "10/10". It is even suggested that October tenth is Longest Johns day.
Spongelick: During music livestreams, Andy and JD have often finished songs with the Spongebob lick. It became so frequent that around September 2020 its name was shortened to Spongelick, and an emote was added for it.
Stomp: During the farewell stream for Dave on the 30th of May 2023, a glitch on YouTube made messages stick to the bottom of people's chat. For JD, a message simply saying "Stomp" from Joli Rouge got stuck and chat kept it going. Several tiny "stomp"s also appeared on screen at various times.
Stringy Planky: In a video of Here's a Health from May 2014 JD refers to his guitar as a "stringy planky". Later, in a livestream, he explained that in the past he would tell students that a guitar is "not a stringy planky" if they play it lying too flat. People from the community picked up the "stringy planky" from the 2014 video as an alternative name for guitars, and have come up with similar names for other instruments.
Thirty birds: At the end of September 2020 when Andy and Sam were playing The Last Door II, they encountered a statue of a large bird with the inscription "Thirty Birds". This started to live a life on its own in the community. It turned into phrases like "may 30 birds visit you in your sleep". It returned in the character "Trente Vogels" during a playthrough of Scarlet Hollow, who is canonically thirty birds in a trenchcoat.
Tony's Chocolonely: On 13 Nov 2022, in a Discord discussion about the controversial flavor of Hershey's chocolate, Andy mentioned that his favorite chocolate is Tony's Chocolonely. Several people were unfamiliar with the brand and subsequently posted about finding and trying it. As there were no livestreams happening at the time (the band being away on tour), this snowballed into ten straight days of almost exclusively chocolate-related posting in the #⛵stream-of-consciousness channel, with periodic resurgences afterward. This episode culminated in one of the mods creating a custom emote of a chocolate bar with "Tony's" changed to "Andy's", and another changing the channel description to add "sponsored by Tony's Chocolonely".