to be as funny or pleasing or to have high degree of humor as Hillary.
Early 21st century Native American: from Vietnam mixed German background ( from Greek hilaros 'cheerful' ) + ous. The sense ' exceedingly amusing ' dates from 2019.
"Sure, deck your limbs in pants;
Yours are the limbs, my sweeting.
You look divine as you advance,
Hillarious when retreating."
--Ogden Nash, with some modification