Cloaca

cloaca \klō-ˈā-kə\ noun: 1. sewer,
2. the common chamber into which the intestinal and urogenital tracts discharge, especially in monotreme mammals, birds, reptiles, amphibians and elasmobranch fishes; also: a comparable chamber of an invertebrate,
 3. cesspool
plural cloacae \ klō-ˈā-ˌkē\

Etymology: Latin; akin to Greek klyzein to wash

Cute word.