When in a group of three there is always the one that doesnt fit in. We consitter him/her as the "3rd wheel" because they just dont fit. If there is a couple together and then one of there cousins, it just doesnt make since for the cousin to be there. If there are two caucasian people standing with a black man, the black man is obvously the "3rd wheel". Two Catholics and a Jew, Two Canadians and a Mexican, and so on
Ryan: jordan, what the hell are you doing with us?

Jordan: shit, i feel like the third wheel
by Ryan Gerstner March 15, 2005
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the best thing to be bc you get to share a relationship with someone (2x)
by addy the baddie April 29, 2019
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Like third wheeling a couple but so much worse because they're not actually in a relationship. You find yourself drifting apart from your best friend as they get a new bff even though they pretend you are still friends and try to keep up the pretence by inviting you with them sometimes. But even when you are with them you feel like they would be happier without you there. You wish your old bff friend would notice how you feel and you would become as good friends as you were before but inside you know that will never happen.
*you, your old bff friend and their new bff are walking together. There talking about plans for next weekend and what they did last weekend; neither of which you were are invited to* I feel like a friend third wheel right now.
by Oggi March 1, 2015
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A disease in which no matter what group of people you're with you're always the one left out.
"I can't believe I got ignored tonight again"

"Yeah that Third Wheel Syndrome is quite the killer"
by Mr.Mac34 January 11, 2015
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Somebody that is always a third wheel because he or she has nothing else better to do, or has no friends to do anything with.
Me:I was hanging out with my girlfriend all day, and Andrew just tagged along everything we did.

Friend:Man what a third wheel tyler!!!
by Griff 22 December 6, 2010
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A test to see if a guy and a girl are more than just friends. You hang out with them, and if you feel like a third wheel, there is something more going on.
-"Are John and Ashley dating?"
-"They claim to be 'just friends,' but I ran the third wheel test and it came out positive"
by #3'd May 26, 2010
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