Buttholearius 

When something said, or done, is so funny it makes your butt hole pucker while laughing.

Boy 1 "Bro, Derek tripped over jasmines dildo walking down his steps!"
Boy 2 "Bro, that shits buttholearius!"

Buttholearius by Swizzle44 February 9, 2017

buttholyarmus 

The conjoint word of butthole and expeliarmus from HARRY POTTER. meaning magical butthole

Wow that girl sure had a buttholyarmus

buttholyarmus by Fug.a.chicken.nug January 2, 2021