" plop "

[Verb]  | "plop" | \ ˈpläp \

1: to fall, drop, or move suddenly with a sound like that of something dropping into water

2: to allow the body to drop heavily —usually used with down

3: to set, drop, or throw heavily

Origin: 1821 ;

 Imitative;

[Phrasal verb]  | "plop down" 

1: to sit or lie down in a heavy or careless way

2: to drop or place (something or someone) in a heavy or careless way

3: to pay or spend (money)

[Noun]  | "plop" 

[Verb]  | "plop"