n. Person who accompanies two (or more) couples in a social situation, who does not have a partner of his or her own. Often the fifth person's attendance is encouraged by one of the well-meaning but ignorant female partners, who may feel sorry for the lonely person, but will inevitably ignore them once the lovemaking starts. It carries the connotation that the fifth person is often an unneccesary and unwelcome addition to the scene in these conditions. Derived from "the fifth wheel of a car", which needing only four wheels to run, has no need of a fifth.
"Jim and Sue, Mike and Sally invited me to come camping with them, but I refused as I would only have been the fifth wheel on my own!"
by Mystikan January 2, 2004
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A person (most likely single) who tags along on a double date.
Yeah... Daniel wanted to join our double date. I feel sorry for that fifth wheel.
by mrbrooksshoe April 14, 2011
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A sexual position in which the female has her shoulders on the ground, ass in the air, and her partner penetrates her by approaching from the back and holding her legs in front of him/her, thus replicating the use of a fifth wheel trailer and a truck
Holy shit, did you see that porn star get fifth wheeled in that video? Her shoulders must be hurting!
by unfickwuthable June 14, 2015
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The person in a friend group that’s technically part of said friend group but is only actually part of it when one is missing. Like a fifth spare tire.
“I wish I had some better friends, mine only treat me like a fifth wheel.”
by Crow98 May 31, 2018
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The act of being the spare person in a group. What a single person does when they go out with a gang of couples. The odd one out.
Yeah all the others were already paired up, I was totally fifth wheeling.

I wish that guy would get some friends of his own, he is always fifth wheeling us.
by Paulsinhis30's April 5, 2009
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its the spare tire on the back of your car, on the truck- perfect condition, with matching rims, and at times, a dectortive case for it-
fifth wheel on back- thats my fifth wheel- fifth wheel say high, wave bye bye- 20's is throwed is there only reply.
by mike jones, who September 3, 2004
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A type of RV, like a pull trailer except the hitch or pin box is over the hook up that is in the bed of a pick up truck. Like a Silverado 2500 or 3500 HD or a Superduty. A fifth wheel evenly distributes its weight over the trucks rear wheels, making the ride smoother. There are many manufactures that offer fifth wheels with different floorplans and can vary greatly in prices and lengths. You need to buy the hitch adapter for hook up after you buy the truck. It can be bolted on or welded on. Unlike pull trailers, fifth wheels will not sway.
I bought a new truck and fifth wheel to go on vacation with.
by TravelingGuy April 23, 2011
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