Third-wheeled 

To be third-wheeled is to be intentionally left out of activities as part of a friend group. If you're third-wheeled, you're most definitely the convenience friend. They'll make you desperate to hang out, but never actually include you in anything. You can expect to be asked to hang out only if nobody else wants to.

If you notice you're being third-wheeled, it's probably a toxic friendship and you should get out of there.

Jim was third-wheeled by his friends so they always had someone to fall back to when they got bored.

Third-wheeled by verwijder January 18, 2021

third wheeler 

When there is a couple together, and one extra person there without a date, so they are 'third-wheeling' the couple.

Mary: You and Your boyfriend (Jack) go to the movies together.
Wendy: It will be boring without you though, can't you come?
Mary: Only if we invite another person so Im not a third wheeler

third wheeler by RRRRRRAAAAACCCCCHHHHH September 30, 2013

Third Wheeler 

Someone who dedicates their lives to a couple by being single and hanging out with them.

Do you see that guy following that couple over there, yeah well he's a third wheeler.

Third Wheeler by BobbyExDeeDee September 12, 2015

third wheeler 

A third wheeler is somebody that tags along with camila cabello and shawn mendes when they're out. They're so sickening cute together, that you just look at them, feeling lonely, being a third wheeler.

shawn and camila were at the beach and connor was a third wheeler

third wheeler by memeing July 29, 2019