A fork of Rural Dictionary
Nipples that are swollen or are bruised, usually after someone has been "titty twisted". Resembles the nipples being twisted like door knobs.
Joey: Yo, look how bruised Patrick's nipples are. Jason: Yea, those are some crazy door knobs
Another word to describe someone or something that is tall, long or fat. B.U for short.
Joey: Yo, Bens dick is a big unit. It must be 7 inches Jason: I heard it was 8, what a B.U!