When someone uses the word K, their most likely pissed off at you, or just want you to shut the fuck up, so take it as a sign, to shut up.
Someone: “I am sorry, can you forgive me?”
Them: “K.”
Someone: “Oh sorry, I’ll go away now.”
That one letter response you get when
A. Someone is mad
B. Someone is annoyed
C. Someone hates you
Trish: hey That text from yesterday I didn’t really mean it
Josh: k
you put a k after anything to show hate or to downplay something or someone
" yoo that nigga jimmy's is a bitch"
"yeo nbs jimmy BIG FUCKIN K"