When you open up a girl's pussy real wide, and, disgusted by what you see, throw up in it.
If you're squeamish whenever you see private parts (you big pussy...) then the chef's surprise is the move for you.
A combination of the Alaskan Firedragon and the Cleveland Steamer, only this time you say something shocking like "I've got worms," then hold her down, shit on her chest, then pick out the worms and make her eat them.
When giving an Alaskan Steamer, make sure you have about 20 gallons of Listerine to wash her mouth with. Now you can give her another one.