An acronym for:
What on earth is wrong with you?!

You can also use
WTSIWWY?! Meaning 'WHAT THE SHIT IS WRONG WITH YOU?!'
Person 1: I just attacked someone on twitter for saying dream cheated
Person 2: Did you like send them death threats or something?
Person 1: Exactly!
Person 2: WOEIWWY?!
by ThtGenderfluidFryingPan December 14, 2021
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