Like flip and flick, fillip is considered a phonetic imitation of the sharp release of a curled-up finger aimed to strike something. Language history suggests that people were filliping in the 15th-century, well before they were flipping and flicking. Specifically, fillip describes a strike or gesture made by the sudden straightening of a finger curled up against the thumb—a motion commonly referred to as a flick. It didn't take long before the sensational stinging smartness of filliping was extended to figurative use. "I mark this in our old Mogul's wine; it's quite as deadening to some as filliping to others," observes Herman Melville's Dutch sailor of wine's "stimulating" effect in Moby Dick.