Slurry bucket
Slurry bucket (slur-ee buhk-et) -n.any orifice in which a hand can be inserted. (Taken form the word slurry meaning a suspension of solid particles in a liquid, as in a mixture of cement, clay, coal dust, manure, meat, etc. with water.)
I couldn’t get Melissa off last night, it felt like I was rummaging around in her slurry bucket for hours.