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1.
1. an affirmative response
2. a noise made out of habbit
"Hey John can you pass me that?"
"Reah"

"....Reah"
by Squishmanchu February 25, 2006
 
2.
Meaning excitment or agreament.
Bob: I got an A on my test today!

Joe: REAH! Thats awsome!
by unknown November 03, 2004
 
3.
hot liquid diarreah spraying out of a blown open anus
man i gotta spray reah
by x August 26, 2003