When you attempt something that takes very little brain power but still manage fuck up.
Matt hit his head really hard and has lots of john moments now.
by Chuggington December 29, 2016
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A bruh moment, but more specific. One suffers a "john moment" when they get curved hard by a girl, especially when they get in a fight with their parents over moving in with her but get dumped in a few months, with said girl going back to her ex that one was a temporary replacement for.
Person 1: "So this girl I was dating just broke up with me and went back to chilling with the dude she was with before me."
Person 2: "Yikes now that's a john moment."
by Dicktionary21 July 15, 2019
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When you forget something incredibly important in a matter of seconds.
"Wait what'd you just say?"
"Oops looks like I had a john brain moment"
by Gamern't May 12, 2021
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A moment in which, the server of dank memes, or indeed any server or group chat, starts talking about CP, for no apparent reason, the chat goes from shitposting to talking about legality and morals of Child porn.

(John Eden was the username of a wierdo who said loli is ok)
Samoht: "oh god, another John-Eden Moment"
by 69gaystreet July 24, 2020
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this is a term used by people for when someone, preferably by the name of John, says something or posts something that isn’t funny at all. that is when the term is used to show how unfunny your friend John is.
“dude, check this out!!”
*John shows something unfunny*
“wow, that’s an John moment.”
by Johnnotfunny2020 October 5, 2020
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John cannot spell therefore he had a John moment
by Cumlordigan September 19, 2021
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a really epic and hot thing that makes every sane person orgasm. foxy john is a very hot man that makes all girls cum
by therealfoxyjohn April 25, 2021
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