One who shakes a bag of drugs at a person, usually of their sexual preference, hoping to get sexual favors in return.
Bag shaker: "hey, Daisey! Wanna get high?"
Daisey: "hell yeah! That's what's up!"
Bag shaker: "I just re-upped! Check out the slugs she broke me off!
(As he's shakin bag of dope in 1 hand & holdin his semi-erect penis in the other)
Daisey: "uughhhh! You've got me fucked up if you think I'm gonna suck your dick for dope. You're such a BAG SHAKER!