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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?!
by SukkaPlzYouLoveMe August 10, 2009

Words related to on his sack

all always be girls guys on over sack to