I wish I could take credit for assembling the following but it is from an excellent Romanian grammar textbook I found online (PDF).
| pac! | a hit, a shot |
| poc! | a hit, a strike |
| buf! | the fall of (esp) a large and heavy object |
| bum! | an explosion, a loud boom |
| trosc! | wood breaking, a slap |
| pleosc! | a splash, the sound of something falling in water, a slap |
| pic! | the sound of water (or other fluid) dripping |
| fâss | the sound of a gas escaping/hissing |
| bâldâbâc! | the sound of something going underwater |
| vâj | the sound of wind blowing/rustling |
.
Personally I think my favorite amongst those is the “blurp-blurp” sound of something going underwater. So cute how it sounds in Romanian :D
AND NOW YOU KNOW!
All Things Romania 
hey, how about “fleosc!” :)
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I have that same book open on my computer right now! Except mine’s is the other version on the site, with the title page and about 10 more pages.
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My favourite interjection since I began with Romanian is pur și simplu “of!”.
Otherwise known as “onomatopoeias” (yes, I had to look up the spelling of that -_- ).
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