Cookie and Milk Greeting

Okay, so the cookie is talkin' to the milk, right? Instead of sayin' "What's up, dude?" like a cool guy would, it says "What's up duud?" Get it? "Duud" sounds like it should be the noise a guy makes after chugging a carton of milk. You're probably a milk drinker yourself, aren't you? I can tell by the way you look. You look like you have a "duuud" coming out of your mouth all the time. The joke is based because it's observational and uses wordplay, so you're probably too dumb to appreciate it.