Presto/ˈprestəʊ/ Definition 1 of 2Pro Tip 1/3Magic Expression Often used by magicians to highlight a magical transformation or sudden occurrence. He said 'presto', and the silk scarf vanished! Pro Tip 2/3Informal Occasions Best used in informal settings, as it can sound playful or lighthearted. I pressed the button and, presto, the garage door opened. Pro Tip 3/3Dramatic Effect Use 'presto' to add drama or showiness, often with a touch of humor. She spun around and, presto, revealed her new outfit.