This joke's short just like Joe Biden's penis.
Oh wait, if I were to make a joke to the size of Joe Biden's penis, I wouldn't write a joke.
Listen up, chucklehead! The 'joke' is that the author thinks Biden's you-know-what is so small that any joke about it would be nonexistent. Basically, they're saying Biden's got a tiny package, which is why you find this so funny, you sad little man.
Senip
And how do you know his penis is small