A relationship based solely on sex, although not just fellatio as the name implies.
Mandy and I had one of the best fellationships I've ever heard of. Started off with a bang too.
A nickname for threesome that can be used in public when you don't want certain people to find out you are really a dirty, dirty whore.
The first night I met him, me and my girlfriend went back to his place for a treestump.