The act of making a snapping sound by pressing the thumb and an opposing finger of the same hand together and suddenly releasing the grip so that the finger hits against the palm.
That which is, or may be, snapped up; something bitten off, seized, or obtained by a single quick movement; hence, a bite, morsel, or fragment; a scrap.
To snap one's fingers: to make a snapping sound, often by pressing the thumb and an opposing finger of the same hand together and suddenly releasing the grip so that the finger hits against the palm; alternatively, by bringing the index finger quickly down onto the middle finger and thumb.