Definitions by SukkaPlzYouLoveMe

on his sack 

To be all over someone. Mainly girls are 'on peoples sack'.

ie.,(1)Guy 1: Dude! she's all up on your sack.
Guy 2: I know!

ie.,(2)Girl: Damn.. Look at that poor guy. That girls all up on his sack!

Girl 2: I know huh?!

on his sack by SukkaPlzYouLoveMe August 10, 2009