To spank is defined as to slap on the rear-end to punish.
(verb)An example of to spank is a parent striking their child's butt with an open hand.
See spank in Webster's New World College Dictionary
transitive verb
Origin: echoic
intransitive verb
Origin: < spanking,
noun
See spank in American Heritage Dictionary 4
verb spanked, spank·ing, spanks verb, transitive
Origin:
Origin: Perhaps of imitative origin
.Learn more about spank