Achilles ball-sack

refers to guy whose only weakness is is scrotal area.

Guy 1: Dude, Molly will fight you!
Guy 2: Hell naw! She fights like a hamster! Can't touch me! 'Cept if she goes for my balls....
Guy 1: Haha gotta protect that Achilles ball-sack!

by HamstaTamer March 1, 2011