When your best friend or roommate gets a significant other. A reference to being a third wheel - all the time.
My roommate just got a boyfriend, and now I'm stuck being perma-third.
When you give a detailed, bitchy description of something.
Emily: I just saw the saddest man. Bald and short like George Costanza; he was less fat, but not thin. Wearing a hoodie and black running shoes with white socks. BUT the best part about his attire was his pants. Golden khaki in color, but in a softer fabric almost like flannel pajamas. ...and they were 2 inches too short. Hope my bitchscription of him cheers you up!