I've heard it in the "Demolition ranch" and don't have a clue what it means. https://youtu.be/79V2iJ6L7lE?t=755 12:35
1 Answer
"Coming in hot" is an idiom meaning that something/someone is approaching with great speed. I hear this mostly in either athletics, to refer to competitors who are catching up, but here it just means that the bullet is approaching quickly toward the dummy.
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1In military contexts "coming in hot" can mean "approaching ready to fire/attack" but that does not seem to be what is intended here.– David Siegel ♦Aug 10, 2021 at 21:41