There is the exclamation "hot damn", which one might use, in certain contexts, similar to " All right!", or "Excellent!" (American English, as far as I know.)
Google ngrams says it doesn't see it anywhere but it does see "hot dam", which is as often as it is used as an interjection; it also seems to refer naturally to an engineering situation involving dams.
- Where does it come from? Is there any initial provenance for it, or other languages it was possibly borrowed from?
- Is hot diggity an euphemism for it?
- Why hot?