To consume a "nick" of marijuana through means of smoking. It has become popular through youthful smokers because of the strange disappearance of nickel bags, dealers have stopped selling these (which are the cheapest bags they usually sell) in order to make more of a profit. Recently dealers have started only because it is more convenient for their customers.
Nicks: Five peice bag($5)
Dime: Ten peice bag ($10)
Dub: Twenty Peice bag ($20)
Buyer2:Hey, got a dub on you?
Dealer2:Nah but i got four nicks
Buyer2:Same place, five minutes.
Jack:Hey you wanna split a twenty?
Bob:Nah im flat broke today
Jack:Does your dealer do credit?
Bob:Nah i've been nickin it at the park cause i can't afford a dub right now.
Jack: You cheap bastard. He still sells nicks? What's his number??