swear words and expletives in Romanian
The complete command of a language includes knowing these too, but they are excluded from most language courses. I will not put a list of Romanian cuss-words here, but here are some good resources for this purpose. Warning: all of these contain dirty language. If that offends you, don't go there.
The best place to start is Wikipedia: https://en.wikipedia.org/wiki/Romanian_profanity
A good different set of (milder) expletives can be found here: https://hostelcluj.com/how-to-swear-in-romanian/
And to practice the stuff phonetically with a native speaker, go here: https://www.youtube.com/watch?v=_9X-VcDvbXU
Together, these provide an excellent grounding.
Whether you use them or not, it's always good to understand what insults may be flung at you in another language. My college Spanish instructor had an entire class on Spanish cuss words so we'd know when we were being insulted. Thanks for the references!