Suche in allen Foren: anywaysThere actually seem to be two versions of this thread, plus another one, so here's a link that should find the others.
Again, I agree with Sharper that it's not slang but a regional variant. (Look up the definition in an English dictionary if you don't know exactly what 'slang' means.)
However, I disagree that it's okay to use it in the standard language, as opposed to at home with family and friends. To me, the test is whether a teacher or editor would correct it in writing. And indeed, as Jannis learned the hard way, most teachers and certainly most editors would not consider 'anyways' acceptable.
So for learners of English, it's misleading to suggest that 'anyway' and 'anyways' are interchangeable. There are other words that
are interchangeable at the same diction level, like 'toward' and 'towards.' But for this word, 'anyway' is the only standard form.