Third wheeling for two couples, so one would be the fifth person (fifth wheel), hence the name spare tire.
Ricky and Jane went with John and Rachel to the movies on a double date. They invited David too. David politely declined, however, telling them that he didn't want to spend a perfectly good Friday night spare tiring.
by Whitest Black Person October 27, 2016
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a bulge of fat around the waist
I've gotta get rid of this spare tire.
by The Return of Light Joker September 29, 2008
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In a group of five friends, the fifth friend can be considered a spare tire.
The spare tire is there to replace one of the other friends if they should become absent. The fifth friend is usually the least liked, and is only enjoyed by the others when their numbers start to shrink.

The spare tire is easily replaceable and cannot do anything against the group or risk being replaced. The spare is also subject to harsh criticism by the four.
As Jimmy was sick that day, Daniel the Spare Tire, would get to take his place
by Smashed Marx October 3, 2017
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the flab around the stomach that can stick out over a women's jeans. obtained by overeating, not excercising enough, or drinking too much beer.

HOWEVER... can be kindof cute on the right woman
small spare tires are sexy, whereas BIG-RIG truck tires aren't
by Cowboyssuck July 2, 2010
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In hold'em poker, a starting hand of Jack/Four. As in, "What's a Jack for?"

I had the spare tire hand in the big blind and was pleased when the flop came out A 4 4.
by Jacaranda May 13, 2008
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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!
by TheJbros11 January 14, 2011
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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.
by Dick Breaker April 23, 2010
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