John Gill Commentary Psalms 59:8

"But thou, O Jehovah, wilt laugh at them; Thou wilt have all the nations in derision." — Psalms 59:8 (ASV)

But thou, O Lord, shall laugh at them
Disappoint their counsels, hinder them from performing their enterprise; send them back with shame and confusion, and expose them to the laughter and derision of others; as Saul's messengers were, when instead of David they found an image in the bed, with a pillow of goats' hair for its bolster, (1 Samuel 19:16) ; the same is said as here with respect to the enemies of Christ, (Psalms 2:4) ;

thou shall have all the Heathen in derision :
either David's enemies, who, though Israelites, yet acted like Heathens to him, as in (Psalms 59:5) ; or the Gentiles that were gathered together against Christ, (Psalms 2:1–4) ; or the antichristian states and powers, who will be triumphed over at the time of their ruin, (Revelation 18:20) ; and even all the wicked at the last day, (Proverbs 1:26) .