Barrel over the Falls
A term used to define a sexual practice wherein a female stands, legs-apart, above a male partner laying beneath her and proceeds to urinate and then defecate on top of him in said manner: "piddle in the middle, plop on top". 


"No, seriously. Kendra was so annoyed that Shaatie tried to 'Cleavland Steam' her the other night, that she busted out a 'Barrel over the Falls' on his ass!" 