I wouldn't have done the ass at all, drunk or not. That's sick. My tounge, doesn't touch areas shit touches. 
But, I haven't had a hangover. Ever. After a few more experiments, I'll reveal my secret. I came up with it ALL by myself. It worked when I tried it((I didn't really try it, it happend by accident)). 
 
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Damn sarcasm doesn't reach other people. I think thats nasty aswel...