The person in a group of people (usually two, though sometimes more) who is most often left out of things.

The third wheel is usually there for one of two reasons - to act as a mediator, such as with a couple, or to be the "convenience friend" when nobody else is there to hang.

Third wheels are not normally forcefully excluded from activities, but they're not usually invited or informed about them either.

Not to be confused with being third-wheeled.
Jim left the friend group because he was sick of being excluded as a third wheel.
by verwijder January 19, 2021
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I tried to help him, but he's too lost to eve realize he's a third wheel
by talexirl September 14, 2022
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Depending on the situation there's tons of ways to define what a third wheel is! A third wheel typically is person that tags along with two others, usually they are ignored or unwanted. This also can be defined as a person that serves no purpose or has no use in a situation.
She keeps tagging along on our adventures. She's just a third wheel.

We're doing all the work, why does she get to sit around and be a third wheel?
by Elijahvvx August 14, 2022
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Usually the odd one out of the group (3 people), this person does not fit in and typically has a strong intolerance for eggs.
"Is that guy puking up eggs?"

"I bet he's a third wheeler"
by KingSlayer72 March 13, 2018
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