0 an exclamation used to express approval, agreement or encouragement, especially by Navy SEALs (= members of a highly trained force within the navy in the US and some other countries that deals with special operations involving water):
"Let's do this! Failure is not an option!" - "Hooyah!"
As Thai Navy SEAL divers rescued the last of the boys from the cave, they were greeted by shouts of "Hooyah! Hooyah!"
He explained to us that “Hooyah!” is used in the Navy as an acknowledgement or a “yes sir!”.
When you say “Hooyah!” you’d better mean it and do what you said you’ll do.
