FMOK

Abbreviation for "For My Own Knowledge"

FMOK I would like to know what you did to get that result

STO

Sick Time Off

During a discussion on the work Slack

"I'm STO today" which means, I'm Sick Time Off: off today because I'm sick...

Morternoon

It's the contraction of morning and afternoon. It's mostly used at work when you start your day, but people on a different timezone are already in their afternoon.

Morternoon! (yes, it's that simple—it's like when you say Morning!)