Udder Disappointment

Listen up, buttercup. This joke is udderly simple (get it?). The author is making a pun. "Udder" sounds like "utter." So, instead of saying "utter disappointment" or "utter failure," they're using "udder" because, well, cows have udders. And you, my friend, are probably milking this explanation for all it's worth because you didn't get it at first.