Definition of oorah:
(N) :
a battle cry common in the United States Marine Corps since the mid-20th century.
(N) :
Oorah Kiruv Rechokim, Inc ("awaken and bring in those who are far"), better known as Oorah is an incorporated Orthodox Jewish outreach (kiruv) organization, founded in 1980 "with the goal of awakening Jewish children and their families to their heritage."