Mom's minivan

Related to the shocker, (two in the pink, one in the stink), Mom's minivan is performed with two fingers in the "pink" and a fist in the "stink."

Lady: Wanna do something special tonight, sweetie?
Lady's Partner: Sure honey! Would you like to try out Mom's minivan?
Lady: Golly, that sounds swell! Why would an act be called such a silly thing, though?
Lady's Partner: You know...two in the front, FIVE IN THE BACK!!!