verb
always followed by an adverb or preposition plops; plopped; plopping
informal
[no obj] :to fall, drop, or move with a sound like something dropping into liquid
[+ obj] :to drop (something) into a liquid so that it makes a splashing sound
to sit or lie down in a heavy or careless way :to allow your body to drop heavily or carelessly [no obj]
[+ obj] :to drop or place (something or someone) in a heavy or careless way :plunk
plop down
[phrasal verb]
plop down (money) or plop (money) down US informal :to pay or spend (money)
noun
plural plops
[count] :the sound made when something (such as a small object) drops into liquid - usually singular