Dad goat: Son, do you know what I like to eat?
Son goat: No, what?
Dad goat: Goat meat.
Son goat: *Gasps*
Dad goat: Nah, I'm just KIDing.
Dad goat: Son, do you know what I like to eat?
Son goat: No, what?
Dad goat: Goat meat.
Son goat: *Gasps*
Dad goat: Nah, I'm just KIDing.
Listen up, buttercup. This joke is funny because the dad goat tricks his kid into thinking he eats other goats. The punchline is a "dad-joke" because he used the word "kidding" which sounds like "kid-ing" aka eating a goat kid. It's a pun, you wouldn't get it if you were smart.