someone who is TOO addicted to cigarettes and/or a drug, and constantly bothers you to do it.
snap: "hey man lets blaze up an L"
you: "naw im cool with that"
snap:"come one man dont you wanna get high?"
you: "get away from me you fucking snap"
snap: "hey let me get a cigarette"
you: "you just chain smoked 2 packs shut the fuck up"
snap: "come on man you got a whole pack let me get a cigarette"
you: "quit being a fucking snap before i beat the shit out of you"