n. a Benzedrine capsule or tablet. : You got a benny or two you could spare a poor man? , Aren't bennies sort of out of style?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Medical Dictionary
Main Entry: ben·ny Pronunciation: 'ben-E Function: noun Inflected Form: pluralbennies slang: a tablet of amphetaminetaken as a stimulant
[ben-ee] 
), 1894–1974, U.S. comedian.