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Muddy Tire 

A sexual act where one partner gives the other a Rim Job except the recipient failed to wipe their ass after their last shit, thus making the rim/tire muddy.
After taking a shit i realized there was no toilet paper to wipe my ass with, so i called in my girlfriend and had her give me a muddy tire.
Muddy Tire by Olmec May 9, 2008
Related Words

The Spare Tire 

Similar to the Third Wheel, the spare tire is that fifth person you bring on a double date who has to sit by themselves.

This can be especially embarrasing if the spare tire has to pull up a chair to a booth for four.

Spare tires are usually your socially awkward homies or people you feel bad for.
I'm never hanging out with Billy again. He said we were just going to the movies with 'some friends' but I actually just got played into being the spare tire!
The Spare Tire by TheJbros11 January 15, 2011

dirty tire

When a hoe blows mad mud and does not wipe, and you fuck the SHIT out of her asshole; followed by making a ring of shit around her asshole.
Yo, that bitch was hungry for a dirty tire. So she came out of the shitter and I slapped my dick in her dirty asshole and made a fat ring around her pooper. Wow, it was great.
dirty tire by Samuelfucksmen September 9, 2006

Spare Tire 

Playing off the expression third wheel, fifth wheel, etc. A spare tire is a person (male or female) that you bring with you on a date. If the date falls through or you're not having fun, you rely on the spare tire to get you through the night.
Ya she was a total bitch. Good thing I brought Gabe along as my spare tire.
Spare Tire by Dick Breaker April 23, 2010
1. a impotent man

2. a flaccid penis

3. a stupid or useless person

4. the prank of stepping on someone's shoe
He narrowly avoided becoming a flat tire.

Canadian Tire 

A great place to pick up hot Canadian chicks.
John met Amy at Canadian Tire while he was getting his car fixed, and couldn't wait to bang her.
Canadian Tire by Tomato Head October 13, 2006