buttonstein 

Another word for fleek or 'on point'.

Man girl, your eyebrows are buttonstein!

buttonstein by biffula September 23, 2016

buttstein 

Pejorative used as a retort against people who mock your intelligence by sarcastically calling you Einstein.

May also be used as a general term for someone being an idiot, along with asshat and fucktard

"Good job, Einstein"
"Shut up, you're a buttstein"

buttstein by alyssa April 4, 2005