Did you eat Chef Boyardee's food?
No, why?
Boy are deez nuts so big.
Boy Are Deez Nuts
Explanation
Explain Bear
Okay, listen up, buttercup. The joke is that "Boy are" sounds like "Boyardee." Then comes the "deez nuts" punchline. If you don't get it, you might be a lost cause, which is saying something considering you're reading this.