You know it
I think our team is good enough to go all the way this year.
|ATTT||Ain't that the truth|
|A2D||Agree to disagree|
|IAWTCSM||I agree with this comment so much|
|Big mood||This is definitely how I'm feeling|
When someone sends you YKI (you know it), it means they heartily agree with your previous message. (And also, that the two of you are so in sync it's slightly freaky.)
When used this way, YKI is often accompanied by a winky-face emoji, smiley-face emoji, exclamation mark, or other mark of enthusiasm. It turns out, people like having other people agree with them, especially on things they're passionate about.