Buttocklouse 

A form of excretory insect; which parasitically resides within the hairs of the host's rectal passage and on the buttocks.

"Ach shite-There're Buttocklouse eggs in ma crap!"

Buttocklouse by Mr. Stab June 10, 2004

Amphibious Buttocksous 

Frog butt. Sagging over weight, older female buttocks.

Wow she has a serious case of frog butt, scientifically known as Amphibious Buttocksous !

Amphibious Buttocksous by Frogman19985 November 13, 2010