plop /plɒp/ verb, plopped, plop·ping, noun, adverb

–verb (used without object)
1. to make a sound like that of something falling or dropping into water: A frog plopped into the pond.
2. to fall with such a sound: Big raindrops plopped against the window.
3. to drop or fall with full force or direct impact: He plopped into a chair.

–verb (used with object)
4. to drop or set down heavily: She plopped her books on the desk.
5. to cause to plop: The fisherman plopped the bait into the river.

–noun
6. a plopping sound or fall.
7. the act of plopping.

–adverb
8. with a plop: The stone fell plop into the water.

Personnellement, je l'utilise surtout comme salutation ou lorsque je ne sais pas quoi écrire (ce qui revient légèrement au même).

plop