( informal ) used in reply to a question that you think is silly :
'Do you think they'll win?' 'Do me a favour! They haven't got a single decent player.'
( informal ) used in reply to a question that you think is silly :
'Do you think they'll win?' 'Do me a favour! They haven't got a single decent player.'
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005