Top Definition
to masturbate

This stems directly from Hilary Duff.
I walked in to my dorm and caught my roomate duffing it.
by Zane U. August 29, 2005
Masturbating, jacking off, spanking the monkey, slapping the ham, whacking off, or beating your meat.
Did you hear that ryan was duffing it in the middle of class the other day?

Duffing it isn't a crime.
by con09 November 17, 2009
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