What does Psalm 73:9 mean?

They set their mouth against the heavens, and their tongue walketh through the earth. (Psalm 73:9 KJV)

They have set their mouth in the heavens, And their tongue walketh through the earth. (Psalm 73:9 ASV)

They set their mouth in the heavens, and their tongue walketh through the earth. (Psalm 73:9 DBY)

They have set their mouth in the heavens. Their tongue walks through the earth. (Psalm 73:9 WEB)

They have set in the heavens their mouth, And their tongue walketh in the earth. (Psalm 73:9 YLT)

Interlinear

They set <shathath> their mouth <peh> against the heavens, <shamayim> and their tongue <lashown> walketh <halak> through the earth. <‘erets> (Psalm 73:9 KJV)

Adam Clarke’s Commentary

Verse 9.  Set their mouth against the heavens] They blaspheme God, ridicule religion, mock at Providence, and laugh at a future state.

Their tongue walketh through the earth.] They find fault with every thing; they traduce the memory of the just in heaven, and ridicule the saints that are upon earth. They criticize every dispensation of God.