What Malfoy shouts at the good guys at the end of "adult" version of Harry Potter and the Deathly Hallows.
Draco caught sight of Harry, Ron, Hermione and Ginny staring at him, nodded curtly and shouted "what yo' mudblood asses doin' starin' at me mugglefuckers!"
V. To exceed the necessary effort required to complete a task, resulting in damage or malfunction.
Adj. Can be used to describe the state of something damaged, abused, over worked, etc.
1. I was tightening a bolt, and to be certain it was good and tight I torqued it a bit extra and I muscle-fucked it. I snapped the head off the bolt.
2. Don't muscle-fuck the lid on the mayonnaise jar! Someone might want to get in there some day.
3. I had to replace the driver's side seat because it was completely muscle-fucked.