A response designed to point out, on an internet messageboard or similar, that a person (the target of the command) is unfamiliar with certain inside jokes (meme), has not been around very long, or is a generally inept poster who needs to contribute less to the conversation (lurk) until he/she is more informed.
1337n00b: Can someone explain why that guy is in so many photoshops? I mean, sure he looks funny, but...
What a gatekeepingasshole says on a message board such as Reddit to a new user who doesn't understand an inside joke.
User A: <Says inside joke and gets upvoted by other users who got the joke>
User B: What does <inside joke> mean?
User C: Lurk more peasant User A: Fuck you prick
Ruler of Lake Titicaca. Rumored to have a bunghole that gets very angry if it does not receive toilet paper. Cornholio the Great is often seen walking around with his shirt over his head and his hands in the air, chanting songs about his power, and his bunghole.
"I am Cornholio! You do not want to face the wrath of my bunghole, for I need TP!"
Butthead: Shut up, Beavis! (uh huh huh huh)
Beavis: Um, okay. (heh heh heh heh).