Sentence:  Not in “Cincy,” with the twang that was so often heard in casual conversation in the corner “<WSD>Pony Keg</WSD>” mini-marts. There you could buy snow cones, the daily "Cincinnati Enquirer", Hudepohl beer, five-cent Ibold cigars, and Reds baseball trading cards. 
Meaning of the word marked with <WSD> tags:  A drive-through liquor store; "by extension", any convenience store.