buttweevils 

The small beetles that feed on the debris lodged in a particularly unclean person’s asshole hair.

Not having seen him for over a decade, I never imagined that my ex could harbor such a horrific case of buttweevils.

buttweevils by Dr Bunnygirl May 11, 2019

buttweenis 

'weenis' is the extra skin on your elbow
'butt' is your gluteus maximus, or for you idiots it's the ass
therefore when combined it is the extra skin on someones glutues maximus.
usually used when insulting someone or just complimenting them.

"you're a fuckin buttweenis!" or "wutssup buttweenis?"

buttweenis by Paloma M. November 20, 2006