Definition of "plunk down" []

• Set (something or oneself) down with or as if with a noise (verb)

WordNet. Princeton University. 2010.

• "Roll up, roll up, plunk down a quarter and try for a prize, take your sweetheart on a ride to the stars, lotsa room for the kiddies, yessir, no need to push, plenty of room, plenty of time, plenty of fun for everyone."