The act during gay sex where a man has inetrcourse with another until the point of orgasm, and then quickly pulls it out and rams it inside another man.
by Nickolaus May 14, 2006
Quickly and painfully inserting the penis into a woman's anus forcefully, especially at an unexpected time.
"My girlfriend and I were fucking last night, and I felt like bumstabbing her. I now live on the street."
by Nickolaus May 14, 2006