Top Definition
putting ones testicals into a girls anus and then masturbating then ejaculating onto her back.
man me n this female where getting down, next thing i know i was copping two in one
by clickyray June 22, 2008
2 more definitions
masturbating while taking a poop
jay pulled a twoinone at his girlfriends grandmas house
by warhero87 April 04, 2010
Its 2 nipples in one ariola
zach has a twoinone
by TheKidInYourMom December 08, 2010

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