mud pie surprise

1. The act of when a man is having sexual intercourse (or oral sex) with a woman, he fakes like he is about to "cum to fruition" by pulling out and setting up to finish on her face. Instead, he forces a huge and slimy dump (diarrhea in some cases) on her face as a surprise.

2. When a woman is eating out a guy, midway through he begins to fake as if he is getting really turned on and tells her to continue with the action further. As she does, he forces out a wet dump into her mouth and on her face surprising her in the act.