n.: straight off the ice, on the instant moment, on the instant, in an instant, before you know where you are, without(any) loss of time, on the nail, in short order, at prime tense, first thing off the bat, (the)first thing, soon, straight away, promptly, in nothing flat, in two twos, without hesitation, out of hand, off hand, on a dime, straight off, bang off, without further thought, in no time, on the spot, without moving from that place, then and there, trice, instant, in a trice very quickly or suddenly