butyraceous

/byoo-tuh-REY-shuhs/, adjective
having the nature of, resembling, or containing butter.

"To be honest, Margaret, I think your boyfriend is butyraceous, but only in the way that he melts when you put him on toast."

"Gary, this essay on Andrew Jackson's rise to political office is butyraceous, and I mean that in the worst way possible."

"Okay, let's try that again, but this time butyraceously."