This is a term refering to a person who has had BALLS written on their forehead while sleeping.
Example1: In the movie Garden State the main character gets doped up and wakes up with BALLS written on his forehead in permenant marker
Example2: My friend Mellisa (ball-face) who fell asleep while watching garden state, thus requiring us to endow her with the same marking.
"Gee, ball-face (Mellisa) hasn't called me in forever..." friend-"Maybe its cause you keep calling her ball-face?"
When you pay money to go see a movie at the theater and the movie sucks so bad you would rather have your balls pounded flat with a wooden hammer than to see the movie again.
Bob: Hey! Did you see that movie with Jennifer Lopez?
Harry: Yeah, it was a ball pounder.