1) A bag of weed that is .5 of a gram. It can go for about $10, no more than that.
2) United States currency. Equal to $00.05. Five Cents.
3) Also known to sellers as a bag of weed that is worth about $15. The weight is not measured, it is up to the dealer to how much is in the bag.
"Yo, lemme get a nickel bag."
"That'll be $10, son"
"I remember in my day when gas cost a nickel!"
"How much do you put in a nickel?"
"About 1.5 if its mids"