Usage of ちまう (not "sense of regret" or "accidently do" usage)

Question

I am familiar with the different variations of ちまう, じまう, しまう, ちゃう etc.

I am mostly familiar with the "sense of regret" or "accidently do" usage, but I am confused in sentences like this:

どうでもいい潰しちまえ！

化け物を殺せ 殺せ 殺しちまえ!

行っちまえ!