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POC means "piece of crap"
look at that POC, he looks like a monkey and begs that his life matters (it doesn't)
It means "speed up writing", "hit enter" or simply "I've seen your typing indicator".
Basically, it may be used whenever you see someone's typing indicator (e.g. on Discord) and they don't send the message in a short while (they are are either writing a whole paragraph or are unsure whether to send the message).
••• Marc is typing...
Alex: poc
Poc means people of color!
People who are not white such as black people, Asian people, mixed people etc
Anna : I'm black
Ruby : oh! So your poc?
Anna : yeah
reaction to something being incredibly funny/humorous
Person1: dude look at this funny image xddd
Person2:Poccc OMGGG PPPPPOOOOOOOOOOCCCCCCCCC