when a girl has her period. used in the movie clueless by cher.
girl: i'm riding the crimson wave
boy: no fair! how come u get to go surfing?
by ema7 February 19, 2006
When a woman is on her period.
Man, I hate riding the crimson wave. I get so bloated. . .
by Synthetikax May 05, 2007

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