Sheepish Pun

Listen up, chucklehead. You are probably the kinda guy who wears socks with sandals, so let me break it down for ya: This is a dad joke relying on a pun. The dad says the son looks "sheepish" (like a sheep). The son replies with "That's too baaaaaad," mimicking the sound a sheep makes (baa) while also saying "bad."