Plumping the Peach Share definition Flag Rubbing a penis or phallic object between someone's buttcheeks while pressing them together. The titty-fucking of the booty. He was nervous for his first pegging experience so I started by plumping the peach as a warmup. Plumping the Peach by xxQueenBea September 5, 2022 Get the Plumping the Peach mug.