When someone breaks into your car through the roof as it is usually the weakest part in some old cars.
usually done in large lots and done to many cars at once
things obtained from roof jobs consist of Motorola phones, fishers, and sony color tvs.

A term used to reference cannabis/marijuana/weed.

a roof job is when a chick lays on her back on a bed or coach or other similar surface (preferrably butt ass naked) with her head hanging over the edge. the dude then straddles her head, grabs her by her hair and/or ears, shoves his cock into her mouth and begins to bang for all he's worth - effectively knocking the shingles off the roof of her mouth

SECOND DEFINITION
when a considerably tall man gets a considerably short girl to get on her knees and suck his cock. the necessity of the short girl to stretch her head and neck in the upward position to reach the cock achieves the same effect of the roof of her mouth getting the shit banged out of it. Let's not forget the hair, head, neck grabbing to get the appropriate amount of banging and gagging. :)

When two straight men meet on the roof of a house and drink the piss of each other.

the act of giving a guy head who is uncircumcised and ripping the foreskin off with your teeth