Hawt = A late 1940's and early 1950's acronym for "Having A Wonderful Time."
Now the word is used on the internet as slang for something reeeeally hot.
Even when hitting the streets of NYC, smoothie in hand, Olivia Palermo’s off duty, casual double denim outfit still managed to look as beautifully polished and glossy as the lady herself. Wearing a vintage look, loose fitting 7 For All Mankind denim shirt, skinny jeans, neon camouflage flats by Pretty Loafers and so ‘of-the-moment’ festival friendly reflective-lens sunglasses, Olivia (and her permanently perfect red nails) looked HAWT!