Top definition
the act of being a dirty sac. being rude to your closest homies, and sometimes sac doesnt decribe the way you feel to your buddies about them stealing your girlfriend.
so use chumsac!
"dude, i hooked up with your girl." "WTF YOU CHUMSAC!?!?!?!?"
by creator of sac January 30, 2008
Happy St. Patties Day!