When you have that extra bit hanging over your belt....another word for muffin top.
Marie: I like them jeans on her.

Emma: eww no look at the spare tyre hanging over the top in all its mushy greatness.

Marie: yeah you're right they'd look so much better on me hohoho!
by The Hippy Hippy shake October 25, 2007
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the definition of spare tyre - when the female or male uses the female or male when either are feeling down. ( for example, when the tyres flat on a vehicle, you only use it when you need to ).

or - the person uses one another when he or she only needs or wants something
by eshay1na March 30, 2011
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A friend who is primarily used as a backup wen other, more entertaining options go awry or are simply unavailable. The "side dip" of the friendship list. The "Wii" when the other more entertaining friends Xbox and PS3 have been broken through excessive use. The "spare tyre", the one you were hoping not to use.
1. When a friend,lets call him Jack, only starts talking to you at a late hour, lets say 01:25. But at no other time...YOU are the spare tyre friend
by sparetyrefriend January 18, 2011
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Another term for a fifth wheel.

The only single person in a group of 5 where there are 2 couples.
“I feel so bad for Nicky, he was spare tyre to Alex and Javira and Terese and Anthony
by minky gonks January 7, 2022
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