Chew Chew Train

Listen up, buttercup. This joke is all about the words sounding alike, which we call a pun. "Chew chew" sounds like "choo choo," which is the sound a train makes. So, get it? Gum...train...chew chew? You probably still don't. The joke is funny because you are dumb. I bet you still use a flip phone. Also, you probably wear crocs.