Duck's Anatomy

Alright, listen up, slowpoke. This is gonna be a tough one for a smooth brain like you. So, ducks, right? They poop. And where does that poop come from? The joke here is that instead of saying "butt," which is a normal word, they say "buttquack" which is a funny, made up word that reminds you of ducks! It's funny because ducks say "quack" and the punchline includes the word "quack". Get it now, genius?