[1] : Jargon File (4.3.1, 29 Jun 2001)

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"


see also:
ack 

[2] : The Free On-line Dictionary of Computing (27 SEP 03)

nak
     
        negative acknowledgement
     
     
see also:
negative acknowledgement 

Nak >> N Words
Nak, definition of term: Nak
nak_pag1.html