drop your sack

expletive used most frequently by high school coaches to motivate players by insinuating that their players testicles have not fallen to the normal pubescent altitude

Coach Todd: Hey Gibbons! How about you drop your sack and hit the shit out of this baseball right chere?
Gibbons: What a fucking douchewad. Im gonna strikeout for that.

by Baron von Bullshit February 1, 2007