Surfer on Acid is a sweet and sour cocktail made with Digestif Liqueur, Coconut Flavored Rum, and Pineapple Juice. The word ""acid"" in the name refers to the sourness of the pineapple juice, while the ""surfer"" part refers to the tropical flavor profile of the drink. This cocktail is said to have originated in the 1990s, and it has been a popular choice for beach-goers and party-goers ever since. While there are many variations of this recipe, the basic ingredients remain the same. For those looking to add a bit of extra punch to their Surfer on Acid, consider adding a shot of vodka or tequila. Cheers!