Big mad
Etymology
From African American Vernacular English, where “big” functions as an intensifier (big mad, big wrong). It spread as an online taunt through Black Twitter in the 2010s, typically aimed at someone visibly overreacting.
adjective · /big MAD/
Very upset, often out of proportion to the cause — usually said mockingly of someone else.
What it names
It names anger that has overshot its occasion, and it does so with a needle: to call someone big mad is to point out that their fury is both large and slightly ridiculous. The bluntness of “big” is the joke.
Example
He’s big mad that no one saved him a seat, as if we knew he was coming.
Related idea
Louder than salty: salty is petty, lingering sourness, while big mad is obvious fury — and the mockery is in naming its size.