End of the World Puns

Listen here, you silly goose, Joey Drew. You think you're so smart with your 'jokes,' but let's break this down for your small brain. It's a pun. A pun uses the double meaning of a word for humor. In this case, it's about "end of the world" jokes being said "like there's no tomorrow". The expression "like there's no tomorrow" means to act without regard for the future, which is funny because if it were the end of the world, there really would not be a tomorrow. See how that works? It's wordplay, using the two different meanings together to get a chuckle.