Emotional third wheel 

The act of being with a person who is trying to comfort another person when you have no real reason to be there. You are not helping in the act, though you originally intended to. You appear to just be a random person sitting next to someone who is trying to emotionally comfort another.

My friend James was comforting some girl because she had a fallout with her boyfriend. I was gonna help comfort her too, but he kinda took over. I felt like I was an emotional third wheel and left them to their talking and cuddling session.

Emotional third wheel by Anon Y. Mous 74 October 6, 2013

Real third Wheel 

A person that has sex with a couple

A coupe devil status

Technically

Proper definition of a third wheel , roll together completely

married couple invited their friend to have sex with them and they fucked

That friend was the third wheel

Alot more stable and control achieve

Definition by Mr.Gusher / Soapy Sardines

Real third Wheel

Real third Wheel by SoapySardines aka Dorian August 19, 2018

Three Way Third Wheel 

A Three Way Third Wheel is a loving union made between three individuals of platonic desire. This relationship can take the form of two girls, one boy or more preferably two boys and one girl. The connection made by these three Love Birds is Strong, flexible but undoubtably enduring. Like any other relationship a Three Way Third Wheel can have it's up and downs, testing the members ability to forgive and move on. But what makes a Three Way Third Wheel so special is that regardless of ones blinded misguided doings, grudges and resentment is absent of view. Forgiveness is instead bestowed upon the wrong doer thus strengthening the wheels integrity and forever reassuring the everlasting love and devotion each member has and always will have for the their two soul mates of endless desire.

"Caitlin, Josh I'm sorry for being a twat. I meant no harm... I was just joking"

"Oh Tahan there is no hate in my mind"

"Thanks guys. Hey Josh What time is it"

"Three Way Third Wheel High Five Time"

Three Way Third Wheel by ILOVECAITLINMUDDLEANDJOSHCOLES August 2, 2013

Designated Third Wheel 

A designated third wheel is a special type of third wheel.

S/he is supposed to barge in and purposefully interrupt a steamy love session because the couple just can't pull apart once they get at it.

Used to keep track of time and bring them back to "the real world".

Antoine: "Man, things got steamy with Veronica the other night. We kept at it for seven hours! Her parents were furious."
George: "Damn bro, you need me to be your designated third wheel?"

Designated Third Wheel by Ant1kana September 6, 2021

The Third Wheel 

In porn when there are 2 girls and a guy but one girl only participates only orally, and usually sparingly, if at all.

I was watching a video called AllAnal last night and even though it had Mischa in it, she was the third wheel and didn't do anal at all. She just gave the guy some head and sometimes licked the other girl.

The Third Wheel by Eric Ha January 20, 2022

Digital Third Wheel 

Same as becoming a third wheel but in the company of another who prefers to text/converse with someone else than you. Typical occurrence for 'besties' which one of them recently got engaged in a relationship.

A: Saw you riding train next to the popular chick, how'd it go?
B: Boring. I got Digitally third wheeled the whole ride.

(A: Digi-wha..?
B: a 'Digital Third Wheel' is- Same as becoming a third wheel but in the company of another who prefers to text/converse with someone else than you.
A: Dang that sucks..)

Digital Third Wheel by Suzu-nee January 17, 2024

rubber wheel on the third rail 

1. Totally clueless. 2. Willfully and proudly ignorant. 3. Out of touch with reality.

"His entire life, especially in public office, with a record of bad decisions, inability to form coherent unscripted sentences, coupled with that self-satisfied smirk, all prove he's usung a rubber wheel on the third rail."

rubber wheel on the third rail by glazeonglass May 25, 2008