What happens if a boy bumps into a dog?
It’s a bumper team.
Listen up, buttercup! So, a "bumper" is that thing on a car that stops it from getting too banged up, right? When the joke asks what happens when a boy hits a dog, the answer "bumper team" is a play on words because it sounds like "bump her team". It's funny because it uses the word "bumper" in a goofy way to make you think of somethin' else.