Giving up and snapping out of anger/stress at the same time
"Monika that dumb bitch broke up with me. I swear to god I just wanna die and kinda go berserk at the same time." - "Don't, bro. Flipping the rear will just make it even worse."
Used and invented by Vincentus, the phrase "I am paining" is very similar to "bruh" and often used when someone says something stupid, or something (unexpected) negative happens.
"Metal is satanism!" - "I am paining"