Help a city guy out, what is a shooter?

(In the city we use the term shooter to describe either (1) the passenger in the car that is in charge of commuting security or (2) a drink in a bar that reduces intelligence to minimal levels).

JHAP
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"My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives."
...Hedley Lamarr (that's Hedley not Hedy)