A pterodactyl screech of anger, glory, happiness or rage. Depends on what you're reeeeeeeing about.
It's often seen in video game chat rEeEeEeEEeeEeeeeEeeEe
Friend: I totally failed that test. REeEEeeEEeEEEEEEeeEeeeEee
Me: ReeEEeeEEeeEEEee same
Buy a
ReeEEeeeEeeeEeeEee
mug!