General

Yeah i've seen other ones like gamblemaxxing and drugmaxxing

all right

The only time I've ever heard "maxxing" is poopmaxxing I dont think anyone seriously uses it

"Maxxing" as a concept came from the 4Chan incel community in reference to body hacking. It leaked into the wider online community by way of the Alpha Male bros. At which point people started to use it ironically to piss the wider manosphere off.

You know, I'm somewhat of a fatmaxxer myself...