ACK

   1. [common; from the ASCII mnemonic for 0000110] Acknowledge. Used to
   register  one's  presence  (compare  mainstream  Yo!). An appropriate
   response to {ping} or {ENQ}.

   2.  [from  the  comic strip Bloom County] An exclamation of surprised
   disgust,  esp. in "Ack pffft!" Semi-humorous. Generally this sense is
   not  spelled  in  caps  (ACK)  and  is  distinguished  by a following
   exclamation point.

   3.  Used  to  politely  interrupt someone to tell them you understand
   their  point  (see  {NAK}).  Thus,  for example, you might cut off an
   overly long explanation with "Ack. Ack. Ack. I get it now".

   4. An affirmative. "Think we ought to ditch that damn NT server for a
   Linux box?" "ACK!"

   There is also a usage "ACK?" (from sense 1) meaning "Are you there?",
   often  used  in  email  when  earlier  mail has produced no reply, or
   during  a lull in {talk mode} to see if the person has gone away (the
   standard humorous response is of course {NAK}, i.e., "I'm not here").

[glossary]
[Reference(s) to this entry by made by: {ENQ}{NAK}{ping}]