Definition of "Plunk" :

noun: (baseball) hitting a baseball so that it drops suddenly

noun: a hollow twanging sound

verb: pull lightly but sharply with a plucking motion

verb: set (something or oneself) down with or as if with a noise

verb: drop steeply

verb: make or move along with a sound as of a horse's hooves striking the ground

adverb: with a short hollow thud