What does Backfiring Bull mean?

Backfiring Bull meaning in Urban Dictionary

once you (boy) along with your mum are receiving anal intercourse inside her bed room, your dad walks in. You assert him to screw you in the butt. When he is fucking you, you sperm in your mum's ass and she shits all the sperm and shit out onto your face. Whenever your dad is mostly about to climax, he sperm's in the shit, which can be on the face, and smears it-all around the human body. This is the "Backfiring Bull".