"Are you related to Yoda?"
"Because yo-delicious!"
"Are you related to Yoda?"
"Because yo-delicious!"
Listen here, buttercup. This joke is based on the similarity between "Yoda", the name of the Jedi Master, and "yo delicious". It's a pun, see? Like, the person is saying that someone is so good that they must be related to Yoda, but it is actually a play on words.