When a person lays on their back and another person balances their belly over the first's face. The belly, pulled down by gravity, is then lowered onto the face, where it is then given a raspberry. One of life's greatest joys.
Person 1: I think I'm ready to take the next step.
Person 2: What're you thinking?
Person 1: Gravity Raspberry.
Person 2: Oh, darling!