buttyiff 

When furries practice anal sex, often using the term tailhole to describe the point of entry for penetration. Usually used as a playful or cutesy term.

"Murrr....I wanna buttyiff that tight little wolfie so hard it comes out his muzzle! :3....."

buttyiff by Faril Iredell December 9, 2008

buttwiff 

A really funny thing to call somebody back in the day that i vow to make popular again. A dipshit. (you know you used to say it)

You are such a buttwiff.

buttwiff by christa November 14, 2003