Found the definitive fRump nickname: IQ45.

[lindysalsagal]

That's it. My work is done, here.

https://www.democraticunderground.com/1016199471

Scroll to the bottom: Thank you, Claudette Jefferies.

[Tiggeroshii]

1. Yep thats gonna stick

[TEB]

2. Brilliant

[Leighbythesea]

3. My new fav

Thank you.

[lapfog_1]

4. STABLE BOY GENIUS

[underpants]

5. Yes!

I don't know if it's original but I'm going to call those who still support him - Trumpskulls

[BHDem53]

6. Very nice but

I think 45 is a little high.

[lindysalsagal]

8. Ok. I had that coming.

I sahree!

[underpants]

7. :-)

Brilliant

Link to tweet

?s=17

[sdfernando]

14. Awesome! Major points for the reference

To Pirates of Penzance!

[underpants]

15. Yep

I was thinking about that earlier today but I don't really know enough about those musicals.

[democratisphere]

9. Excellent!

[Motley13]

10. I doubt he can spell IQ

and I mean the abbreviation

[Progressive dog]

11. Very descriptive of Trump's genius

[shanny]

12. I have thought Dolt45 a good choice also.

avoids the obvious problem of implying the dotard has an IQ above freezing.

[MLAA]

13. Love it...along with my personal favorite IMpotus

[KelleyKramer]

16. But but.. Trump said he scored almost 100 on his IQ test!

Kidding aside, I like iq45, it's catchy