It's from "Freaks and Geeks" by Childish Gambino.
"You get sloppy drunk, I stay whiskey neat."
Most Helpful Girl
It's a pun - whiskey neat is whiskey without any ice or anything else in it, but obviously the 'neat' also contrasts with the 'sloppy'. Just a somewhat clever way of saying that the singer is better than the other person and more controlled.0