noun: droopy, wrinkled, testicles that belong to a man 45 years or older. Just the thought of old man balls (more commonly referred to as O.M.B.) is enough to make you shudder with disgust.
Girl 1: "So, how is Paul in bed?"
Girl 2: "Oh man, he was turning me on and all, but then I saw his Old Man Balls (O.M.B.), and I would have needed to do some meth to get on that!"
A B'Mantoff is the collective noun for the weirdest group of friends, whose whole sense of belonging revolves around a given subject they all study. The B'mantoff can be found from 9am-10pm in the library being much louder than they should. If you encounter the B'mantoff expect to see laughter, a lot of snacks and the faces of people on the brink of breakdown.