Meaning of rah-rah

rah-rah

Pronunciation: (rä'rä'), [key]
— adj. Informal.
  1. marked by or expressive of ardently enthusiastic spirit: a group of rah-rah undergraduates; a rah-rah attitude.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.