A barracks cougar is much like a barracks bunny, only older like mom or grandma status. Usually in their early 30's late 40's.
Marine 1: Dude! That chick is old enough to be my mom why is she in the BRKS?
Marine 2: She's A Barracks Cougar!
Marine 2: She's A Barracks Cougar!
by AwesomeNess One April 16, 2010