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2.
This is what happens to a man's penis and testicles when he gets scared, nervous or cold. His junk has major shrinkage.
I took my pants down to show her my big unit, I guess I was nervous and it was playing turtle on me.
by You Bet May 09, 2009
 
1.
It's an expression use to describe the harsh feelings of wanting to use the toilet really badly.

Is a game where two or more people try to hold out from craping in there pants the longest. The winner is the person who does not shit themselves.
You know how a turtle sticks his head in and out of its shell? Well that's what I'm doing to my ass, I'm playing turtle with my crap.
by B0$$MAN January 08, 2010