surprise muffin

When you go to perform fellatio on someone and there is a particularly surprising amount of pubic hair.

Sarah met a guy on Friday night with no hair on his arms or legs, but when she went to give him a blowjob he had a Surprise Muffin.

Muffin Surprise

A particulary unpleasant fart that is completely unexpected by the party being surprised; usually in a setting that is not fart-friendly.

Sitting in church with my friend, I released a silent fart that packed a horrendous odor. I wispered to him that he had been muffin surprised. He was outraged and relocated to another pew.