zack

Short for "exactly." Used mostly in text or other digital messaging media when you are in a hurry, or want to sound like a hip young person who knows what's up.

(sends friend a meme about how they only need a 398% on their final to pass a class)
Friend: "My microeconomics class!"
Me: "Zack!"

(gets in argument with friend that culminates in saying "We can agree to disagree")
Friend: *shrug emoji, eye roll emoji*
Me: "Zack."