Plumpkin Share definition Flag Similar to a blumpkin. To receive a blowjob whilst sitting on a pumpkin. Nick: "my butt is all orange!" LARS "WHY IS THAT NICK?" NICK: "KAYLEE GAVE ME AN INTENSE PLUMPKIN!" LARS: "SO THAAAATS WHERE MY JACK-O-LANTERN WENT!" Plumpkin by elZILLA June 1, 2009 Get the Plumpkin mug.