Growing Football

Listen up, buttercup. This joke is all about a "pun," which is when a word or phrase is used in a way to give it a funny double meaning. In this case, the joke plays on the phrase "it hit me." The person is confused why the football is getting bigger until it hits them, literally. Then they realize the football is getting bigger because it is physically hitting them. You are likely overweight and would not be able to dodge a football.