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1.
Pokémon #26. The evolved form of Pikachu.
My Thunder Stone evolved Pikachu into Raichu?
by Donkey Kong Song February 04, 2003
 
2.
Evolution of Pikachu in the Pokemon world.

Raichu is deprived of the word "ray" wich is "lightning" in japanese
"Raichu can kick some Squirtle butt!"
by Killy the fox April 18, 2004
 
3.
Anyone who exhibits characteristics similar to a the pokemon Raichu, most typically fat goth chicks with heavy eye makeup, frizzy or dry hair, unhealthy orangish skin, and/or excessive blush.
Oh shit look out! Raichus are coming.
by Aybraus March 17, 2008