An adjective used to describe a person who is; smelly, slippery, disgusting, talks weird, has a clear backpack, doesn't wash their hair, eats lots of mexican food or an event that is along the same lines.
That dickhead just cut me off in traffic. What could I do? I wasn't gonna ram into him and smash up my own car, so I just gave him a good greasy as I drove past him.
What's with that bitch? She keeps greasing me off.