A condom; thin rubber or latex barrier device worn over the penis. May also refer to an improvised or jury rigged condom. Often used to emphasize the large size of the penis.
Bitches better take their cunt pills cuz I ain't wearing no gunny sack.
She only had kimonos so I used a sock for a gunny sack.
An old wild western type of bag with draw strings, that often carry potatoes, corn, and other types of goods. Hobos and rail riders would often take these sacks and make pants out of them.
May also be used as an insult, indicating you are lazy, or a bum.
"Your so hot, you would look good in a gunny sack."
"You freakin gunny sack, go take out the trash."