bottynibbler 

A person, animal or carnivorous plant that finds nourishment in the arse of others.

Emilie is, without shadow of a doubt, one of the world's most adept bottynibblers.

bottynibbler by Tom Bowtell February 26, 2003

buttnibbler 

one who nibbles butts.
a person who is a wicked dork, dufus, and moron.

Harry Potter, you big tosser, don't be such a buttnibbler.

buttnibbler by manz13 January 3, 2010

Bootynibblee 

One who gets their booty nibbled.

Do you see that ass? She must be a bootynibblee.

Bootynibblee by Haitus_from_society January 6, 2017