Official source.
I’m actually surprised on your link that “Oh” is not at the start of the chorus.
BYU Football Wiki"The Cougar Song," often colloquially referred to as "The Cougar Fight Song," "The BYU Fight Song," or "Rise and Shout, The Cougars Are Out," is the school fight song of Brigham Young University. It is often played at BYU sporting events, especially at BYU football games, and is popular with...
https://byufootball.fandom.com/wiki/The_Cougar_Song