Mad Ass-Hatter is that
one guy /girl who is absolutely batshit crazy and also an
asshat/jackass.
Usually reserved for exes, enemies, or frenemies.
Can be used as an action word as well to describe
weird situations/drama.
Example 1:
Person A:
Dude,
Jack is such a mad ass-hatter.
Person B: I know right? Can’t believe I dated that fucking psychopath.
Example 2:
Person A: Yo, did you just see what she did to
George?
Person B: Yeah, that was some weird mad ass-hattery, my guy.