When two people have sex for longer than thought humanly possible, resulting in damaged bedroom funiture such as broken beds, pillows (hence the name), cracked bedroom tiles, and torn/soiled sheets
Derived from a derogatory term for gay men when in the passive position during anal sex.
Now used to describe moments of intense ecstasy where pleasure touches pain.
Man 1:"Wow, that pill I dropped was fucking mental. If I had tits, I would have cum on 'em."
Man2:"Yeah, I know. You should have seen your face, you looked like a right pillowbiter."