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.