What does Assin The Engine mean?

Assin The Engine meaning in Urban Dictionary

When one male of a big size using nick name " Big Engine" is unexspectant of nasty action which coming at him , along with his agressor "Matt" taticaly get's infront of Big system' face and " Bare Ass Farts" while farting spreads his ass cheeks available and tends to make contact with the top motor's mind or face with a strong chance of fecies flying from Matt's butt and landing on engine.