Handbanging
male masturbation.
Cliff: Where's Timmy?
Timmy's Mom: He's upstairs handbanging.
Timmy's Mom: He's upstairs handbanging.
handbanger
Any loser who goes into a chat room with the intent of jerking off to those who chat with them in the room on a daily basis.
"Lol, that anon who just joined is definitely a handbanger. Just look at that username, how lame..."