The gelatinous, viscous, amalgamation of diarrhea and usually seminal fluid that drips from the anal orifice down to the catholic schoolgirl knee-socks after a romping good round of buttsex.
Teacher: What is 3+3?
Student 1: I smell poop.
Student 2: Hey Jill, whats that stain on your socks??
Jill: O no i forgot my butt plug. The butt fluid is a-flowin'.
Teacher: Well, go confess.
Jill: Why? It's the priest's fault for ramming it in too hard.