What is the meaning of Spank?

To beat, smack or slap a person's buttocks, with the bare hand or other object, as punishment, or for sexual gratification.

To soundly defeat, to trounce.

To hit very hard.

An instance of spanking, separately or part of a multiple blows-beating; a smack, swat, or slap.

A slapping sound, as produced by spanking.

An instance of masturbation.

To move quickly and nimbly on foot; to stride or run at a brisk pace.

To move or turn rapidly, as the gears of a machine or the sails of a ship.

To shoot out or throw violently; to hurl or knock out.

A leap or bound.

Source: wiktionary.org