When a couple becomes bored with their relationship and begins to constantly "hang out" with a "friend" together and thinks this friend is the coolest thing ever. Both people in the relationship crush on the friend, usually unknowingly at first. A third wheel crush requires at least one bi or gay person on the couple's side.

As Kit Porter from the L Word says, it's dangerous business.

If you identify yourself as the third wheel crush in a friendship, get out of it fast. It usually leads to one of them cheating with you, a threesome that goes nowhere, or lots and lots of screaming and blaming you for destroying what they had.
Friend #1: "John and Mary text me every day asking if I want to go over to their house and hang out. And then each of them will invite me to go eat out without the other being there, like they're taking me on a date. If they weren't together I'd think they both had a thing for me."

Friend #2: "You're in the middle of a third wheel crush, man. Nothing good can come from this."
by Aune February 23, 2009
Get the Third Wheel Crush mug.
Third wheel syndrome is a problem with a person who can be in a conversation but pays no attention to it what so ever has a tendency to repeat what others have just said as they were not listening.it comes from never being someone number one person in life so they have never had attention paid to them fully thus never had to pay attention gets a lot worse over time
Mary: did you both see breaking bad last night
Sarah : yes was great
Mary: Tina ?
Tina : what?
Mary : ugh you have third wheel syndrome bad babe
by ByRik February 10, 2021
Get the third Wheel Syndrome mug.
A threesome which involves a single person and an already established couple.
John and Jennifer invited me to their house for a steak dinner; long story short: shit happened, and we ended up having a third wheel threesome.
by Living Ass May 19, 2021
Get the Third Wheel Threesome mug.
When two of your best friends date each other, so that means you're third-wheeling both.
"Hey! I heard Tess got a boyfriend, how's the third wheel life?"
"Double third-wheeling, you mean, her boyfriend's one of my other best friends."
"Ahaha, sucked in!"
by ThatFluffyUnicorn August 6, 2018
Get the double third-wheeling mug.
Any person who attempts to engage in unwanted electronic conversation (ie. texting, instant messaging, etc.) with another person who is concurrently skyping, texting, or messaging another person. (Especially his or her significant other.)
Velma: Hey, so have you talked to Susan lately?
Tracy: I was on facebook chat with her yesterday, but she was on a skype date with her boyfriend, so she didn't say much.
Velma: God, Tracy, even on the internet, you're still a cyber third-wheel.
by bencoar July 24, 2010
Get the Cyber third-wheel mug.
The effect of being left out by your friend because he/she is with someone else.
Most teens face the Third Wheel Effect when their friends start dating.
by Not John Doe April 10, 2015
Get the Third Wheel Effect mug.
When you are with a friend who is with their other best friend and you get ignored by laughing and giggling and don't fit in.
I went out with my girl last night and got totally friendship third wheeled.
by Brizzlemynizzlefashizzle February 28, 2016
Get the friendship third wheel mug.