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1.
noun.

A call made by all faithful osprey in the events of bonding together through the perpetual efforts to vanquish the beast.
Thus the time will soon draw near when all osprey call out, "REEE!" and the beast shall be destroyed. Only in this time will happiness again be found.
by Monkey-University of Maryland November 12, 2004
 
2.
The sound many brutal death metal vocalists manipulate with their vocal chords to make the characteristic sewage gurgle vox in bands like Gorgasm and Disgorge. For those of you who do not know what this sounds like, image putting your head inside a toilet bowl and flushing it. That sound is replicated with human vocal chords in an ultra-guttural REEE.
After hacking at the now-dismembered fetus, we devoured its cranial chunks..REEEeeeeeeeeeeeeeeeeee
by ToxicDisgorge July 30, 2005
 
3.
v.

The extended call of the osprey, which when in effect, joins all osprey from the four corners of the Earth. The coming of all osprey allow for the final destruction of the beast. Reee needs to be in full effect for the elimination of the hellish beast, whom tends to destroy the world.
Reeeeeeeeeeeeeeeeee...all Osprey UNITE!
 
4.
A vocalization that indicates that the speaker is on a quest for ass, or that he/she is particularly interested in someone's buttocks.
"Woah. Did you see that chick walk past? That was a NICE ass."
"Reee!"

OR

"What... is your name?"
"John Doe."
"What... is your quest?"
"Reee!"
by Innuendo-san March 26, 2007