Punching The Dumpster
When your boyfriend is really terrible at sex, he is punching the dumpster.
Oh damn, my boyfriend came over last time and he was punching the dumpster all night long. :(
Punching the Dumpster
The fisting of the anus, generally aggressively. Basically, exactly what it sounds like...
"Yo, my ass kills. Boyfriend was punching the dumpster last night"