a slang term for condom. generally used in a group when one is talking about using one to a friend or needs one from a friend but does not want a person or persons in the group to know what he is talking about.
Rudy: bro i need a potatosack, i might FINALLY get some this weekend and i need to be prepared, you feel me?
Javy: dude for weezy? id help you out, you know that, but ive only got one left...sorry...
Rudy: whatever, i'll just drop by the drugstore or somethin tomorrow. peace