What does "topless" refer to when ordering a drink?

When ordering a drink, "topless" specifically refers to the absence of a salted rim on the glass. This term is often used in bars, particularly in relation to cocktails that are typically served in rimmed glasses, such as margaritas. The process of salting the rim enhances the flavor of the drink and adds a festive touch, but some patrons may prefer their drink without that extra element, thus ordering it "topless."

The other options pertain to different aspects of drink preparation: no ice refers to serving a drink straight, no garnish means omitting decorative additions like fruit or herbs, and no sugar typically relates to reducing sweetness or avoiding added sweeteners. Each of these terms is valid in drink ordering, but "topless" is uniquely tied to the concept of a salted rim.