1 definition by Ninja6781
When you have sex with a girl while upside down, and then while she is upside down, performs fellatio on a second male. it's like a castle.
You: "Did you hear about the threesome I did a few days ago?"
Friend: "Oh, the one where you did a white castle with your roommate and his girlfriend?"
You: "Yeah, it was fucking nuts."
Friend: "Oh, the one where you did a white castle with your roommate and his girlfriend?"
You: "Yeah, it was fucking nuts."
by Ninja6781 July 26, 2010