(Entry 1 of 2) —used to express sudden excitement, astonishment, or relief. whoo. noun.

Is it woo or Whoo?

Woohoo is an exclamation of excitement or joy. Woohoo is typically used alone as an interjection preceding or following a sentence that explains what the excitement is about. It is also seen as woo-hoo, woo hoo, and whoo-hoo.

Is Whoo in the dictionary?

An expression of delight. The wailing cry of a ghost.