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1.
Anal Sex followed by Oral Sex. The penis will still be covered in fecal matter, which will then be inserted into the partners mouth. This persons mouth becomes nasty and yucky, thus giving him/her a nasty yuck mouth.
Yeah, I fucked that bitch in the mouth right after I fucked her in the butt... Yeah, I gave her a Nasty Yuck Mouth.
by Chuck Norris April 07, 2005