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Obviously, a whack is what you apply to get it back into whack.  aka 
'percussive maintenance'
I suspect the term became popular during the early days of radio and 
television.  We had a Zenith (strained LBC content) TV for some years that had 
to be occasionally whacked.  We graduated from a gentle rap of the knuckles to 
a full swing blow of the fist before it finally gave up the ghost ...
Randall
On Sunday, October 29, 2000 11:14 PM, Bill & Skip Pugh [SMTP:anabil@caltel.com] 
wrote:
>
> Why do we  say something is out of whack?  What's a whack?
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