Fifth Wheel
A person who feels left out
Example
That party was so lame. I def felt like the fifth wheel when they went on and on about their threenagers
Fifth wheel definition by Slang.net
This page explains what the slang term "Fifth wheel" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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Fifth wheel is a term for the feeling a person has when he or she feels left out of a group. It commonly occurs when a person is doing something with two other couples who are acting more intimate and romantic.
The fifth wheel term is the same as the third wheel term except it involves two other couples instead of just one. Since wheels usually come in twos or fours, like with bikes and cars, a third or fifth wheel is odd, which plays into the "odd one out" feeling. Fifth wheel situations may arise for a variety of reasons such as a group of friends feel bad for their forever alone friend and invites him along or the fifth wheel has fun with the friends but then they get all snuggly on the couch.