It just means word. Like a word, im assuming. Theres no other reason why it should mean anything else.
In Rap - it means "ain't that's the truth" "Agree with you" etc. Slang version is equivalent to the old fashioned "you said it" (agreement).
In text messaging, "NK" typically stands for "no kidding."
It may be a typo and the implied word may be good or google.
No comment!
LAO
Cf
"Uff" is a term commonly used in text messaging to express frustration, annoyance, or exasperation.
The abbreviation "ph" is commonly used in text messaging and online communication to mean "personal hygiene."
will call back
"I love you"
Tons of Yorkies.
Cry out loud
Oh boy