A high on is some one who gets off on getting high. Much like a cop who gets off on giving these same kids a hard time. A high-on will do anything it takes to get high on mary jane, they often are skilled in creating bongs out of pop bottles and pens, and are good to have around when weed smoking is clutch.

Got the covid-19 vaccine

A Person Who Gets High Off Of Anything ... usually Marijuana lol ALOT

Defines someone as a person who is high or gets high.

High-on Someone who smokes Dope all the time.
A person that likes to get high all day.