Whenever I tab out of the game and try to tab back in the screen goes black and it wont load, if I spam tabbing out and ctrl alt delete a bunch of times it eventually lets me back into the game... fix pls

You should download the default Toribash which is in the Toribash Website
Its rather different from the Steam version of it because you an open multiple clients in the Toribash Website version.

I got same problem with my steam version.
But anyway, I got official TB client too and there's the same issue. I think it happens because of bad PC or something

It could be your pc having a headache, try going windowed it usually wont do it then.

Tabbing out usually bugs me when I try it aswell.

But after going windowed it doesn't.

It doesn't happen in window mod, true. But issue with full screen mod is still exists.