Slang used to describe sexual activity involving oneself's anal cavity especially if the receiver is rather large from behind. Typically the posterior-end is referred to as "dumpy" which is due to roots within the word "Dumptruck" (which is a vehicle commonly used to haul large quantities of sediment from one location to another), and the word "bumpy" being used to describe the motion of anal sex where one bounces off of their partner.
by LowerParchment July 5, 2022

A screaming bumpy is when you have back seat anal sex in the back of a Toyota Carola doing 60 mph down a dirt road
by anonymous August 1, 2022

by Big Pimping 42069 October 5, 2023

by ProfSnuggles April 15, 2016

by Twurzy July 7, 2018
