Being hit in the face by a hot and humid air stream after getting out of an air conditioned building, car or airplane.

Got the covid-19 vaccine

Not really a "slap" in the traditional use of the word,but a sharp clicking sound produced by flicking the index and middle fingers of one hand against a channel of air created by a space between some of the fingers of the other hand. This is an extremely difficult maneuver to produce and seems to be an attention-getting sound used by Armenians from Armenia itself.