Sex, as in thrusting two hairy, smelly parts of the body into each other till gooey liquids spurt out.
We were bumping nasties all night man, she was looser than my ass after an all you can eat mexican buffet!
by Anonymous May 28, 2003
1. A synonym for the dancing form commonly known as grinding

2. A male usually standing behind a female as they both move their hips to the beat of degrading music
Everybody at the school dance was bumping nasties when the disc jockey played a sexually explicit song.
by mealsies February 25, 2007

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