Top Definition
When you push the head of you penis back into the shaft rolling it in. Then you tuck your rolled dick into your ballsack so that it looks like you have three balls.
We were getting changed when I looked over and saw Mike was triceratopsing.
by Frank McKinley September 08, 2014
A game in which a person shouts triceratops then ducks down and slams their head in to a person or car.
What's that guy doing?

he's triceratopsing that car.
by goth757 August 18, 2013
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