The act of having his and her danger zones touch one another in a highly sexual erotic manner.

i.e: do the dirty, jump one anothers bones, sexing one up, intercourse, sandwich dancing, arousing with genitals, sexual friction, ect.
The other night, Harriot and I were bumping dirties real nice, when mother and father walked in. Family dinner will never be the same.

It was a dark cold night, the heat went out, and to keep things hot, mother and father decided to bump dirties. Nine months later came the consequence, ME.
by Kel & Dea April 3, 2007
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The act of having his and her danger zones touch one another in a highly sexual erotic manner.

i.e: do the dirty, jump one anothers bones, intercourse, sandwich dancing, sexual friction, ect.
The other night, Harriot and I were bumping dirties real nice, when mother and father walked in. Family dinner will never be the same.

It was a dark cold night, the heat went out, and to keep things hot, mother and father decided to bump dirties. Nine months later came the consequence, ME.
by Danielle A. & Kelly C. March 22, 2007
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1. To grind, bump, caress, or somehow come in contact with another persons genitalia while on the dance floor with one's own genitalia.

2. To dance erotically and arousingly at a club, where contact between clothed genitalia is occuring, or "bumping."
Dang broskeet, last night at the Happy Hop I was bumping dirties with Kyle's aunt on the dancefloor!
by cbreenster April 14, 2009
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We're you do a line of cocaine off of someone Else's ass starting from the crack and going down.
Babe you wanna do a dirty bump?
by Cocainemaster August 9, 2017
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