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The act of touching oneself in private places to excite in an effort to achieve climax, or to orgasm. The act is completed when one achieves their orgasm.
Also known as the action of masturbating.

It can be used to describe the process concerning either gender.
Example 1:

Jill: Ew did Tim just bump one off in your bathroom?

Beth: Yeah I think he did - don't go in there.

Example 2:

Guy outside bathroom: Are you done in there? I need to use the bathroom.

Guy in bathroom: Leave me alone, I'm bumping one off!
by FalconFlight April 22, 2009
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