I ran into a neat little trick while dying for the umpteeth time for not paying attention enough.
Open the console of your browser and make sure you have the correct reference frame selected, normally gameiframe on kongregate.
With the game open and running, after having selected a character and simply displaying the map, paste the following line in the console and enter, enjoy the rampage!
gs.activeCharacter.addItem(gs.itemTypes.MobFucker,0,1)
Don't forget to select it in your weapons list. ;-)
You simply gotta love it: MobFucker!! :-D