meslf - did you not give yourself one, or should that be handle, mask, subriquet, tag, byname, diminutive of oneself/myself, appellation, or label?

I came across a beauty - Ian Duncan who was adjutant to Theresa May at one time and had to pick up the mess after negotiations failed. He was apparently referred to as Monsieur le Poop Scoop. That's Brexshit for you!