Meaning

noun a light sharp contact (usually with something flexible)

noun a short stroke

noun a form of entertainment that enacts a story by sound and a sequence of images giving the illusion of continuous movement

originFrom Middle English flykke (“light blow or stroke”). Later uses apparently interpreted as a back-formation from flicker. The use of flick to mean a film or movie derives from the fact that early films had a low frame rate, thus causing the film to "flick" rapidly when projected onto a screen.

Etymology from Wiktionary, CC BY-SA 3.0