What's the difference between jam and jelly?
You can't jelly your dick into someone's asshole.
Jam vs. Jelly
Explanation
Explain Bear
Hey, nimrod! The joke is that you can "jam" your dick in someone's butt, but you can't "jelly" it in there. Because jelly isn't a verb, duh! You probably think jelly comes from jellybeans. Moron!