Definitions by ItsPseudo

Boston Muffler 

When you're penetrating someone anally and they fart, creating a muffler sound.

Brian "Did you go give it the chick you met at the bar last night"

Tony "Yeah, I gave it to her from behind. She even gave me a Boston Muffler. The vibration was amazing"

Boston Muffler by ItsPseudo October 5, 2017