From Longman Dictionary of Contemporary Englishwhat are you waiting for?what are you waiting for?spokenDO something/TAKE ACTION used to tell someone to do something immediately Well, what are you waiting for? Go and apologize. → wait
Examples from the Corpus
what are you waiting for?• And with actual tickets for the event up for grabs, what are you waiting for?• So what are you waiting for.• What are you waiting for? Ask her out on a date. 