ninth wheel
An extremely rare situation which you're the only single person hanging out with a group of 4 couples. Although rare, if this doesn't convince you to get a girlfriend/boyfriend, I don't know what will.
Guy 1: Hey do you want to come hang out with me, Guy 2, Guy 3, and Guy 4? By the way our girlfriends are gonna be there too
You: No thanks man, I don't wanna be a ninth wheel.
You: No thanks man, I don't wanna be a ninth wheel.
ninth wheel by Jimmy the Least June 3, 2016
Get the ninth wheel mug.