NAK

NAK
 /nak/, interj.

   [from the ASCII mnemonic for 0010101]

   1. On-line joke answer to {ACK}?: "I'm not here."

   2. On-line answer to a request for chat: "I'm not available."

   3. Used to politely interrupt someone to tell them you don't
   understand their point or that they have suddenly stopped making
   sense. See {ACK}, sense

   3. "And then, after we recode the project in COBOL...." "Nak, Nak,
   Nak! I thought I heard you say COBOL!"

   4. A negative answer. "OK if I boot the server?" "NAK!"
    

NAK

   {Negative Acknowledgement}