fillip
/ˈfɪlɪp/
The action of holding the tip of a finger against the thumb and then releasing it with a snap; a flick.
A smart strike or tap made using this action, or (by extension) by other means.
(by extension) Something unimportant, a trifle; also, the brief time it takes to flick one's finger (see noun sense 1); a jiffy.
(by extension) Something that excites or stimulates.
The athlete’s victory provided a much-needed fillip for national pride.