It is rare to come across one, but recently we were all proven that it exists. Canonically hot is when a character is officially hot, as told by the creator or in other official sources that have not been corrected statements later on. When this is confirmed, it is likely true in real life as well.
The particular reason that this definition was created was because Nintendo of America president Reggie Fils-Aimé said himself, that Breath of the Wild's main character Link was hot.
Someone who is basically always on the internet and their entire existence revolves around being on the internet. People who are chronically online typically have no real friends IRL, and stay online starting useless debates that literally achieve nothing outside of a screen.
Giselle: Have you seen the weird new girl? I heard her name was Luna.
Winter: Yeah, she hasn’t interacted with anyone since she’s chronically online. She spends her days debating people over ships.
Someone who is so absorbed into online life and discourse that they become unfamiliar with things off the internet. They may also form opinions/arguments that have no meaning or actual importance/depth outside of the internet and online spaces.
"Yo April has been mostly online since they were 14."
person 1: "hey did you hear about that new game that released?"
person 2: "that game was fr mid no cap ratio+L"
person 1: "when was the last time you saw the sun you chronically online fuck?"