When two gay males have unprotected sex, and one male ejaculates into the other male's ass. The "Britton" (AKA the male that ejaculated) will then suck the semen back out of the ass and swallow it.
"My friend was feeling very raunchy. He decided to give his long-time partner, Bill, a dirty Britton. He gagged afterwards. Not cool."
by Too to da Sheyy January 17, 2010