In hockey slang, a garbage goal is when a player scores a dirty goal around the crease on a rebound. Therefore, scoring a garbage goal can also mean to score with a girl who's currently on a rebound from a recent relationship.
"Yo guys, I was at this engineering competition in an hotel and I totally scored a Garbage Goal while my roomate was passed out in the other bed" -- Frank-Peter
by P.KG April 6, 2010