Rotten Pumpkin Share definition Flag The act of a male mooning (showing one's ass)while placing the testicles between the legs at the same time. My large balls felt a great chill as I gave the operator of the chairlift a rotten pumpkin. Rotten Pumpkin by Jeffy Rohr November 11, 2003 0 0 Get merch Get the Rotten Pumpkin mug. Buy Now — $32.95 See more merch