Hooah

Hooah is a battle cry used by members of the United [States Army]. Originally spelled "Hough", the battle cry was first used by members of the 2nd [Cavalry Regiment (United States)|2nd Cavalry Regiment] during the Second [Seminole War] in 1841, after Seminole chief Wild [Cat (Seminole)|Coacoochee] toasted officers of the regiment with a loud "Hough!", apparently meaning "How d'ye do!" Since WWII, the word has been widely used throughout the U.S. Army and gained a more general meaning of "anything and everything except 'no'.
It is comparable to Oorah as used in the United States [Marine Corps].

Possible meanings

Some popular usages of hooah include: