Third wheel

When you are hanging out with two other people usually friends, siblings, or relatives. They always talk to each other and have fun, but you are just tagging along and overhearing what they say. They act like you are not there. Sometimes you have no one else to hang out with so you just go with them. You will always feel left out.

Someone out of a trio whom is seemingly the least relevant.

Me

A person who feels left out by a couple or a pair of besties.

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.

A person who hangs out with two other people. The two other people are closer to each other than the "Third Wheel". People generally feel awkward when the third wheel mentions how much it sucks to be the first wheel (They actually normally get mad).

to follow or tag along with a couple