The act of a male or female taking a dump on their partners chest, then they go to an elevated place and fall backwards into the shit thus making it splatter all over the place.
Billy shit on debras chest, then he climbed onto his couch and gave her the humpdy dump
Humpdy dumpdy also includes standing upright while doing a girl up dabutt and spinning around in cirlces while falling down and ejaculation occurs in the ass
The popped his left nut while giving a humpdy dumpy to A fine ass bitch
When a tornado is so strong that an egg is capable of being shot through a brick wall. Mentioned by Dale Gribble in the 'King of the Hill' television show
"man, the weather girl says we gonna see some mad tornadoes tonight! I'm talkin' Humpty's Revenge an' shit."