Stuff like “god damn”, “fucking hell”, etc. Anything that stems from religious sources. That includes fudged varieties like “jeez/geez” and “heck”.
And to clarify, this isn’t some attempt to avoid blasphemy or anything. I’m not particularly religious and would rather rewrite the neural pathways for those “defaults”, but haven’t been able to come up with satisfactory alternatives so far.
*To clarify further, I’m all good with most other curses (shit, fuck, ass, etc). I’m not trying to be inoffensive, just non-religious.
I’m not really too worried about being understood, just working on it for myself. And honestly, I think anything could be said in a certain way and be understood as a curse/outburst. Borrowing from different languages is a good idea, though!