The best version I've seen yet, thanks to Ian W. Hill on Twitter...

[icymist]

I am the very model of a very stable genius
I tweet elab'rate metaphors on weapons and my penius
I forgo excess exercise as it runs down the battery
And can my loyalest subjects if they don't keep up the flattery
I'm very smart, like, my IQ is not a liability
My mental health I tell you is the bestest at stability
I gild 'most everything I own, I find it most empowering
And even go as far as to prefer a golden showering
HE EVEN GOES SO FAR AS TO PREFER A GOLDEN SHOWERING
HE EVEN GOES SO FAR AS TO PREFER A GOLDEN SHOWERING
HE EVEN GOES SO FAR AS TO PREFER A GOLDEN SHOWERING

For all your hoaxes, dossiers, and tapes of pussy grabbering
Your so-called facts are just no match for my incessant blabbering
In short in matters bigly, yuge, and never ever teenius
I am the very model of a very stable genius
IN SHORT IN MATTERS BIGLY YUGE AND NEVER EVER TEENIUS
HE IS THE VERY MODEL OF A VERY STABLE GENIUS

Link to tweet

[mahatmakanejeeves]

1. All the versions, and I gather there are quite a few by now, should be put in one place. NT

[lagomorph777]

2. Gilbert & Sullivan would be rolling on the floor laughing in their graves.

[better]

3. This is from the Wierd Al parody

"The Pirates of Pence-Ass", right?

[hvn_nbr_2]

4. Only one problem: that's far more literate than the toddler-in-chief. nt