New foreign loanwords came with 19th and early 20th century European immigration to the U.S.; notably, from Yiddish "(chutzpah, schmooze") and German ("hamburger, wiener"). A large number of English colloquialisms from various periods are American in origin; some have lost their American flavor (from "OK" and "cool" to "nerd" and "24/7)," while others have not "(have a nice day, for sure);" many are now distinctly old-fashioned "(swell, groovy)." Some English words now in general use, such as "hijacking, disc jockey, boost, bulldoze" and "jazz," originated as American slang.