An acronym for I Did Your Mom.
Bob: Hey man, IDYM.
Joe: What does that mean?
Bob: I Did Your Mom!
Joe: Hahaha, you owned me :(
Bob: Yes, yes I did.
Joe: What does that mean?
Bob: I Did Your Mom!
Joe: Hahaha, you owned me :(
Bob: Yes, yes I did.
by jrcdude November 03, 2007