1 definition by Sorasen

Top Definition
A person hanging out with two people (usually a couple) that are in a sence leaving him/her out. Called the third wheel because either:

-Having any odd number of wheels on an object generally messes it up.

-Third wheel on a bike makes a tricycle, something thats safe for kids be left alone with.
Well, if your bringing your girlfriend, I'll have to take my cousin with me, don't wanna be the third wheel.
by Sorasen March 23, 2006
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