Shaking the bag
Verb: The act of fondling,playing, or squeezing a sack and or bag that could be resembled as male genitalia.
"Bruh, did you take that girl home from the bar last night? "
"Ya,she was really good at shaking the bag."
"Ya,she was really good at shaking the bag."
Shaking that bag
On the streets shaking that bag often means you got a oz of weed or drugs anything you put in baggie so you say I'm shaking that bag of example...
Lexi: Hey B i bet you don't got no weed do you? :B what you mean I been shaking that bag girl