From Longman Dictionary of Contemporary Englishon top of the worldon top of the worldinformalHAPPY extremely happy When I heard she’d been released I felt on top of the world! → top
Examples from the Corpus
on top of the world• In the spring of 1995, Astros first baseman Jeff Bagwell appeared to be on top of the world.• After winning the batting title, Bagwell appeared to be on top of the world.• We are just sitting on top of the world.• Standing there, on top of the world, my tiredness vanished.• We were, for a time, on top of the world.• Noa was on top of the world. 