All those tiny holes are from gasses in the molten rock offgassing at the surface and cooling. super common with volcanism, but equally common with foundries. Any old steel mills near where you found it?
The red banding is Iron oxidizing out, which again is super common in both.
HAVING SAID THAT,
It isn't a meteorite. They're almost always smooth. Ejecta from an impact CAN look like that, for a few thousand years after the impact. It weathers pretty quickly and either crumbles away or smooths out all the rough surfaces. Any craters near you or where you found it?
If I were putting a wager down, I'd lean toward slag initially. If you can narrow down where it was found, we might be able to really nail it.