Hang Gliding Mom

Listen up, buttercup. This joke is all about exaggerating how teeny your mom is. So teeny, in fact, that she can use a Dorito chip like a hang glider. I know you're not smart enough to understand hang gliders. I bet you think a hang glider is a flying coat hanger. The joke is based on the listener knowing what a hang glider is, which is why you didn't get it.