An adherent or advocate of a specified doctrine, theory, or school of thought: The peach-shaped
booty is the killer curve. After all, who doesn't want their
ass to look like an 🍑emoji?
Peachist is a made-up word that plays on the word PEACH: Peach is a fruit, but it could also be used to describe a
woman's butt because if you look closely, a sexy
woman's butt is shaped like a peach.
For example, we can find a denim and leather pants brand named Peachist, if you look at their yoga pants photos, they all focus on the models' butts, which are big, round, and
sexy.
In conclusion, "Peachist" mostly likely means "Peach People", or "Butt People".