dt

Abbreviation of "Downtime".

This term is used in videogames to indicate a period of time (of any length) during which a player won't be able to play.
It's widely used referring to any IRL activities that can take away your precious game time. (Eating, studying, going out, having a life...)

"Yo bro, why did you leave the party?"

"Give me 5min dt, my mum just called me."

"Hey! Do you want play tomorrow afternoon?"

"Sorry man, I have a test to study for"

"That's dt"