I'mdfwy- (I'm) (d)one (f)ucking (w)ith (y)ou. Similar to the designation idfwy (I don't fuck with you), but used after the fact. Where idfwy is preemptive, i.e. "I don't want to have anything to do with you". I'mdfwy is said after the fact, having known the person and realizing you no longer want to have any communications whatsoever.
Nikki: You're an asshole. I hate you.
Nicholas: After all I've done for you, this is how you treat me.

Nikki: (a week later with no contact via text) Please forgive me. I messed up.
Nicholas: Nope. I'm tired of you always treating me like this. You're not going to change. It's clear now. You know what? I'mdfwy. Bye.
by NickVic August 15, 2019
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