Nope. Not that.
It’s short for modus operandi, a Latin phrase, which translates to mode or style of operating.
While I was off the mark on its meaning, at least I had been using it correctly. And even while using it correctly, I did often wonder if my believed definition was correct, but I never took the time to check before.
So for the record, my M.O. during this pandemic and working from home has been to have a glass of wine after work. Not saying how big that glass of wine is. 😉