1 definition by Skidmark the III

Top Definition
The act of banging your penis onto random object's or people, Often in a windmill style movement.
John: Hey man watch this im gonna go an mill tom
Tom: WTF man why are you slapping your cock on me!

Phil: Last night i was millin jenny's house phone an then her mum was speaking to her friend all night on it!
Dave: Ha! dude she totally has penis breath.
by Skidmark the III December 03, 2009

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