Someone who never has cigarettes of their own and lingers among groups of people (usually friends) waiting for them to pull out their cigarettes so he/she can bum one.

It is from this act of scavenging for cigarettes and the fact that the only trace they ever leave behind are cigarette butts that they are given their title.
*Person 1 sees Person 2 grabbing a cigarette from his pack*

Person 1: Hey bro can I bum one of those? I'll give you one tomorrow after I go to the store.

Person 2: Dude this is like the 5th time you've said that tonight.

Person 1: Come on I'll buy you a drink later.

Person 2: Just take it you damn butt vulture.
by Vyrion November 3, 2009
Get the Butt Vulture mug.