A second third wheel, usually used to balance out a third-wheel situation; someone added to a group of three so no one is left alone.
Jimmy: "Hey Bobby, you should invite George as a fourth wheel so that Harold isn't left out."

Bobby: "Yeah, I'd hate having to leave Harold as a third wheel."

Harold: "Thanks, I think."
by catsonmeth October 17, 2012
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The fourth wheel's job is to make sure the third wheel doesn't step his boundaries as a third wheel.
Girl: Hey, I've noticed that John has trying to cheat with me lately. Should we invite Henry to fourth wheel for us?

Boy: Yeah, I think John stepped his boundaries. Ill call Henry now.
by Celestivic April 10, 2017
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Being left out by your three other friends having a threesome.
Phil: Dude why aren't you joining?

Carl: It's ok I'm just the fourth Wheel

Phil: Bruh
by COKE AND COLA February 22, 2022
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The meal between dinner and breakfast.

Designed for hunger at late hours of the night, most commonly used by people with the munchies, or teenagers sneaking out for midnight cravings.
"Let's head over to Taco-Waco for our Fourth Wheel, we'll get quesadillas and some queso, they don't close until 1"

"The T.H.C in my system is making my stomach feel empty, let's hit Steak-N-Bake and enjoy their 24/7 Fourth Wheel service!"
by Juicy Mane June 3, 2006
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A third wheel third wheeling a third wheeling couple.
Basically a couple goes on a date. A second couple third wheels. A third wheeler third wheels the second couple. The Third wheeler fourth wheels the first couple
by immajewbox July 24, 2010
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When your with a group of people but you still stand out even though it's an even amount
We went to the movies with four people but Cassie was still fourth wheeling
by Carrie Cassandra April 19, 2015
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n. The state of tagging along on a date in which you are not the only one tagging along. Normally this would not be a problem unless you are already dating someone and have no intention of cheating. This is the rare opportunity where there are TWO awkward third wheels. Take the following example:
Dude, I was totally an awkward fourth wheel on Pete's date with Chelsea because Lauren was sick. Chelsea brought a friend but she was shit ugly plus I have a girlfriend.
by Jtime2 February 24, 2009
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