1. GAM is an acronym for G.irls A.bove M.e which came from the website Dear Girls Above Me which was started by a man named Charlie who lives beneath 2 annoying and idiotic girls whom he refers to as Clair and Cathy.
2. GAM can also be an acronym for G.rown A.ss M.an which doesn't necessarily have to be used by someone above legal age. It is often used by assholes who are far from as tough as they say.
1. I ran into the GAM in the laundry room today.
2. "Shut up, I'm a GAM, you bitch!"