The story
- Proto-Indo-European*méǵh₂s
- Proto-Indo-European*méǵh₂yōs
- Proto-Indo-European*meǵh₂ism̥mos
- Proto-Italic*magisVmos
- Latinmaximus
- Englishmaximizeclip.
- English today-maxx
Clipping of maximize, with a superfluous x presumably to mimic Internet slang. Compare doxx.
Etymology from Wiktionary, CC BY-SA 4.0.