Definition of spanks:
(v) :
(transitive) To beat, smack or slap a person's buttocks, with the bare hand or other object, as punishment, or for sexual gratification.
(v) :
(transitive) To soundly defeat, to trounce.
(n) :
An instance of spanking, separately or part of a multiple blows-beating; a smack, swat, or slap.
(n) :
A slapping sound, as produced by spanking.
(v) :
(transitive) To hit very hard.
(v) :
(intransitive) To move quickly and nimbly on foot; to stride or run at a brisk pace.