Slander and obscene talk (Colossians 3:8) are what anger does to the tongue — attacking character and saying hateful things; Colossians 3:8 is a complete map of what to put off.

Slander is attacking a person's character in words when angry. Obscene talk is the broader category of the kinds of things people say out of anger — not just cuss words but the whole register of hurtful, rage-driven speech. Mike synthesizes the full list as a complete taxonomy: anger (the feeling) → you can't bottle it (malice) → you can't let it out (wrath) → you can't direct it at people in words (slander) → you can't express it in any form (obscene talk) → put it all off entirely.