What’s the difference between jelly and jam?
You can’t “jelly” it in her ass.
What’s the difference between jelly and jam?
You can’t “jelly” it in her ass.
Listen up, buttercup! The joke plays on the similar words "jelly" and "jam." "Jam" can be used as a verb, meaning to force something into a tight space. The punchline uses "jelly" in place of "jam" to create a vulgar joke, since it sounds similar, but doesn't really make sense. It's funny because it's unexpected and inappropriate, which is right up your alley.