Third Wheel

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.

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