What does Boston Bun Missile mean?

Boston Bun Missile meaning in Urban Dictionary

the work of of sliding your erect and pulsating user among the buttox of a willing (or unwilling) female. This work is usually utilized as a variant of this "titty fuck" and "buttsex" methods of getting off. The BBM (as it is commonly known as) can be utilized whenever Anal sex is undesirable or flat-out denied because of the female (since the cock doesn't in reality penetrate the sphincter, it just slides between the buttcheeks).Great for a first time whenever she "doesn't do anal".