не иметь ни малейшего представления(сокр. от have not the foggiest idea • I haven't the foggiest how, but this piece of plastic with three holes that you stick your fingers in, spin around and hurl across the room in a horribly annoying fashion, has captured their imaginations to the point that Raffi won't even have a bath without his.4uzhoj)
быть без понятия(сокр. от have not the foggiest idea • Honestly, I've got not the foggiest what day of the week it is, let alone week of the month.4uzhoj)
