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


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!

