From Longman Dictionary of Contemporary Englishprestopres‧to1 /ˈprestəʊ $ -toʊ/ adjective, adverb technical APMplayed or sung very quicklyprestopresto2 noun (plural prestos) [countable] technicalAPM a piece of music, or part of one, that is played or sung very quicklyprestopresto3 interjection American English NOWsaid when something happens suddenly in a way that seems unbelievable or magical SYN hey presto British English You just press a button and presto! A drink appears.
Examples from the Corpus
presto• You fold it like this and presto! It turns into a hat. 