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