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1.
A Girl who could kick your ass and works hard. also known to be amazing and slightly on the short side.
Riah is a Beast. don't let her size fool you.
by anonymous1423 February 04, 2010
 
2.
riah means "flowing". derived from word rhea, rhea is wife of saturn in greek mythology, mother of rome
riah is a beautiful girl
by coolguy33378 October 26, 2008
 
3.
Gay slang (polari) for hair used in the UK especially in the 50s and 60s.
have you seen the riah on her? Tortured
by mcrbloke September 26, 2005
 
4.
A person of little significance, inconsequential. Also known as a non-factor. Associated with failure, a riah can never seem to "get it right"...whether that means failing at running an internet gaming guild or failing to properly report and get banned another guild's forums. On the Dethecus server, this term is widely known and used as one of the worst insults possible.

Coined by Dethecus player, Svarthorne, this term has become known across multiple servers. The original Riah has seemingly gone into hiding as a result although some report sightings of Riah on occassion.
Your guild is in all tier 3 yet you failed to beat a PUG in greens, you riah.
by Papa Roach January 19, 2007
 
5.
to masturbate.
i was riahing the other day and my mom walked in.... awkward.
by riah craig July 30, 2008