"REEEEEE" resembles the sound that frogs make when they feel threatened. 4chan is notorious for Pepe, the frog. So the "REEEEEE" sound is, essentially, Pepe reacting to something he doesn't like.

Sometimes, autistic folks make wild gestures or loud noises to express strong emotions. Also, there's this video of a frog being picked up, and it makes a sort of screeching sound out of fear and anger. …

Here is the original REEEEE. It's been around for a while and the expression is used by some other boards, such as the 4chan examples mentioned in other posts... but they are all just re-using the …

Jan 8, 2017 · They ran with this new definition of the term, now using their pepes to shout "REEEEE NORMIES GET OUT", etc. (Though this had started a bit already by this point just naturally.) It …

Since noone else spelled it out, the 'REEEEE' noise is imitating a mentally handicapped/severely autistic kid having a breakdown when he doesn't get what he wants. People on 4chan tend to be/act like …

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It's the sound of an angry frog. More specifically, it's related to 4chan's /r9k/ board, where the locals refer to themselves as betas -- guys who are losers and feel slighted. It's a self depreciating joke. Anyhow, …

IncelTear is a subreddit for posting screenshots of hateful, misogynist, racist, violent, and often bizarre content created by hateful “incels" (involuntary celibates). We do not condone blanket hatred of …

Pepe is a frog character used by 4chan's R9k board to represent "robots" (basically permavirgin losers). Normies are basically normal, average, everyday, socializing people. Obviously, robots hate …

At least when you peak, you won't be going 'REEEEE I'M PICKLE RICK" in a McD's on youtube.