A person who chronically masturbates. Won't even try to go out and get a partner. A Shut in.
"He won't try to get a girl, he's a real graham gunner always going home to take care of it himself."
"Now that he's a teen he's a real graham gunner always locked in his room"
"Now that he's a teen he's a real graham gunner always locked in his room"
by Dolomite Free Rider October 20, 2016