This refers to dealing with someone (or avoiding them) when they are in a bad way, i.e. when they’re “on the warpath”: “Mr. Griffin is a good boss, but I would avoid him when he’s on the warpath.”

You can also say “get someone on a bad day/in a bad mood” - “Alex is fun to hang out with, but don’t get him on a bad day/when he’s in a bad mood.”

Interesting. Why didn't you add this as your translations?

Do they sound correct?

Absolutely

Done ✅

And am I crazy, or isn’t it more common to talk about NOT popasting to someone pod goriachuyu ruku?

It can be both (or "that"??))
http://search1.ruscorpora.ru/search.xml?env=alpha&mycorp=&mysent=&mysize=&mysentsize=&mydocsize=&dpp=&spp=&spd=&text=lexform&mode=main&sort=gr_tagging&lang=ru&nodia=1&req=%EF%EE%EF%E0%F1%F2%FC+%EF%EE%E4+%E3%EE%F0%FF%F7%F3%FE+%F0%F3%EA%F3

I see, thanks.

Thank you