KANSAS CLAM BAKE Share definition Flag A sex act in which a person puts their rectum against their partner's vagina and proceeds to dedicate inside of her. AKA "poo-in-a-puss" No don't try to hook-up with Matt he just wants to give everyone a Kansas Clam Bake. KANSAS CLAM BAKE by Redrokkit December 9, 2021 Get the KANSAS CLAM BAKE mug.