bench warmer
An athlete who does not get much playing time (usually because they are not very good or skilled). I'm just a bench warmer, so you won't see me out on the court much.
nose-warmer
1. slang A very short pipe used for smoking tobacco or marijuana. I have a little nose-warmer that I keep in my back pack so I can toke up throughout the day. My grandfather used to smoke this pungent tobacco out of a small nose-warmer after every meal—even breakfast!
2. slang The remains of the unburned end (the butt) of a marijuana cigarette. He kept trying to light the nose-warmer in his fingertips and nearly set his moustache on fire! We collected all the nose-warmers in the ash tray and filled a bowl with what we managed to scrape out of them.