What is Mother Of All Fuckers?
1.
A more extreme version of 
After dropping something under a desk and then banging his head on the desk trying to get the dropped thing.
Person: Mother of all fuckers!
See 
What is Mother Of All Fuckers?
A more extreme version of 
After dropping something under a desk and then banging his head on the desk trying to get the dropped thing.
Person: Mother of all fuckers!
See