"Cocktail umbrellas" are small paper umbrellas that are often placed in tropical drinks. It refers to something decorative and fun that is added to make a drink or situation more festive. Full definition
However, a beer cocktail umbrella seems like a pretty novel idea to me when compared to some other patents out there. (rocketlawyer.com)
Not one to be disappointed twice, I already have a bag full of cocktail umbrellas to slip into my purse for happy hour — and plans for this ring to adorn my finger every sip of the way. (bedknobsandbaubles.com)