Horizontal Hippity Dippity
The Nasty, Hoochie Coochie, fooling around, intercourse, the birds and the bees, intimacy, lovemaking, mating, and nooky
So when trying to have "The Talk" with your mother. When she breaks out the old school Horizontal Hippity Dippity you should be afraid, and walk out of the room. In other words "The Nasty!"