Someone who surreptitiously consumes alcohol in order to secretly get drunk or stay that way. The sneaker loves the convenience of those little bottles of booze since they can be easily hidden and disposed of.
Sneakers can easily throw back a little bottle of liquor while in privacy in the bathroom.
My favorite bar has a sign for the sneaker entrance in the back. People use it all the time.
During sex, preferably in Doggy Style, you pull out far enough from the pussy and pop it straight in the ass. Best when done early on in sex for optimum slip and slideness. When you stick it in the ass you then apologize and say it's an accident.
Dude, I was fuckin my bitch last night and i pulled the sneaker. She was pissed but then i said it was an accident.