NKA
It is SOP for soldiers in combat situations to have their blood type readily visible on their uniform, so that if blood transfusion is required, time is not wasted deteriming blood type. Some units also require any allergies to be visible, and if the Soldier has No Known Alergy (NKA) this info is stated. This is commonly seen on Rangers, Special Forces, Navy SEALS and other elite forces.
A soldier that has ''NKA'' sewn on his uniform has no known alergy.
NKA
Not Karen Approved. A comment or action that may trigger extreme emotions in someone called Karen. Usually racially insensitive or stereotypical, not always though.
Yo, What you said about the Indian telemarketer was definately NKA.
Nkaed
The act of being naked alone
Maria was Nkaed in her new picture
nka
a term that originated from reddit, "nka" or No-Karma means you are a nn (no-name) or you aren't known by anybody.
person 1: "you a bitch stop talkin' to me."
person 2: "stfu nka nobody know you!"
person 2: "stfu nka nobody know you!"