Aye, "enormous" is where the confusion begins.
Mainstream dictionaries show the bigness definition as tertiary....
Definition of enormity | Dictionary.com
noun, plural e·nor·mi·ties
outrageous or heinous character; atrociousness:the enormity of war crimes.
something outrageous or heinous, as an offense:The bombing of the defenseless population was an enormity beyond belief.
greatness of size, scope, extent, or influence; immensity:The enormity of such an act of generosity is staggering.
Definition of ENORMITY
Definition of enormity
1: an outrageous, improper, vicious, or immoral actthe enormities of state power— Susan Sontagother enormities too juvenile to mention— Richard Freedman
2: the quality or state of being immoderate, monstrous, or outrageousespecially : great wickednessthe enormity of the crimes committed during the Third Reich— G. A. Craig
3: the quality or state of being huge : IMMENSITYthe inconceivable enormity of the universe
4: a quality of momentous importance or impactthe enormity of the decision
Synonyms & Anton
It sounds like a word trump would revel in using "the enormity of my ego"