* Literally: The fish Dory is spelled "Dory" in bars, just like everywhere else.
* Cocktail: You might be thinking of a "Dory" cocktail. There isn't a widely known cocktail with that name. Perhaps there's a local bar that has created its own signature drink called "Dory."
* "Doritos": Some people might jokingly spell "Doritos" as "Dory" when ordering a bag of chips at a bar.
So, to answer your question: "Dory" is spelled "Dory" in bars, but it could also be a reference to something else!