butter knee

knees with fat on them that makes them look like melted butter; weird ass knees; fat knees

hey look at that girl's butter knee

Knee-Butter

The build-up of sweat and dead skin congealed into a buttery substance. Generally found within deep fat crevices i.e. - knee or elbow area.

It's so hot out, I could slather a whole loaf of bread with my knee-butter.

I need to jump in the shower right quick before the knee-butter begins to solidify.