( informal ) to not know anything at all about sth :
'Do you know where she is?' 'Sorry, I haven't the foggiest.'
( informal ) to not know anything at all about sth :
'Do you know where she is?' 'Sorry, I haven't the foggiest.'
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005