What is Grocery Bag?
1.
when a gay man takes his sweaty ball sack skin and jacks off another guy with it.
ralph: so what did you do with that guy last night, Tom?
Tom: i gave him the signiture grocery bag. duh.
See
2.
when a poor man cant afford any condoms so he re-uses his old one.
"bitch settle down, im gettin this grocery bag all up in your shit"
See