ACK
ACK: /ak/ interj. 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".
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 (sense 2),
i.e., "I'm not here").
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