Someone who wears a leash because they are too hyper.
Guy 1: Look at that leash boy
Guy 2: He probably got mistaken for a dog!
A bratty bottom who pretends they hate their arrangement on the top/bottom relationship, but secretly wishes to stay in the current arrangement.
"Hey did you hear about Bill and Ted having problems with their relationship?" "Oh don't worry about them Ted is a leash muncher it's just part of his dynamic with Bill."
When one of your friends got a new gf and you are rearly seeing him anymore. A girl who got his schedule under full control and he wont resist.
Dude, where is Frank tonight? We were supposed to meet for drinks!
Ahh you remember Amanda, she got his balls on a leash for good now!