a phrase used to describe the act of two holes or openings pounding or touching each other. See also Donut Bumper - one who participates in/enjoys bumping donuts.
Ellen DeGeneres enjoys bumping donuts.

That Rosie O'Donnell is a real donut bumper.
by Will C. December 12, 2003
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The act of two females colliding genitals
"Look at those lesbians"
"How do they have sex?"
"I don't know"
"Like do they just bump donuts?"
by Lesbihonest73 April 19, 2017
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A sexual activity involving rugged vaginal contact between two participating females.
Did you see jane and Denise last night? They were totally donut bumping all night in front of everybody!
by Ryan A H April 26, 2006
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