A pussy that smells so bad it passes as an asshole. A stinky pussy. A pussy one is about to eat until they get a whiff that smells like feces...cunnilingual abort mode is instantly instigated.
Max: "I was as hard as a rock and went down on her, it was so dark I thought I was accidently tonguing her ass until a car went by and the lights shone on us and I could see that it was her pussy that I was licking. She had a serious case of anal muff! I continued anyway 'cause I was so horny!"
Scott: "You scare me dude!"