A condom specifically saved or used for anal sex.
A man is having sex with a girl and she asks him to put it in her ass. His response "i'm sorry i don't have my mud tires with me." You cant go playing in the mud with bald tires.
by BDouts November 30, 2008
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A term to describe when your having anal sex with either a man or woman and he/she accidentally/purposefully defecates all over your balls.
Damn man I was fucking this slut in the ass last night and she totally put some mud on the tires!.
by AnalAdventures June 03, 2009
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When a girl wants to lose her virginity.

Also referred to as "getting your tires dirty" or "getting dirt on those tires"
Person 1: Girl, you better get some mud on those tires tonight!
Person 2: I'm trying!!

or

I better get my tires dirty tonight, or I'll be super upset!

Girl 1: Mud on the tires?
Girl 2: YES!! I got my tires really muddy!!
by wildcats12 March 04, 2009
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