Definitions by Mike Y.

mothers against hard rock 

A fake group that someone with no life started. It's not real people, so don't worry about it.

Mothers against hard rock is fake people... Don't believe it... fuck...

mothers against hard rock by Mike Y. October 16, 2005

yo mama

pathetic retort; unidentified insult aimed at precipient's mother when the speaker has the inability to think of a half-decent comeback.

Person number 1: "You are such a pansy."

Person number 2: "Yo mama!!"

yo mama by Mike Y. March 17, 2003