There are two definitions for california redwick:
1) A type of red weed that grows in parts of california.
2) When a man proceedes to masterbate, usually in a California Style fashion, and from the extended period of time the man begins to bleed from his penis, thus making his penis a red wicked thing.
1) Every day I pull more and more California Redwicks from my garden, but they just seem to keep growing back!
2) I was doing it so long that I didn't even notice my penis become a California Redwick.