n. The weary traveler who stops in to McDonald's to use the restroom and doesn't buy anything. Just takes a whiz and leaves. May be a lone traveler or an entire family. If more than one, "McPees."
McDonald's Employee 1: There goes another one!
McDonald's Employee 2: There goes another what?
McDonald's Employee 1: Another McPee. I mean, can't they just use the bathroom BEFORE they leave the house?