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Pro fireballer Brian Wilson says it's "f**king exciting" to bring his talents -- and his tremendous facial hair -- to L.A., telling TMZ he's pumped to play for the Dodgers.

A mohawked Wilson was leaving Equinox gym in L.A. yesterday -- right after signing a 1-year, $1 million deal with the Dodgers -- and expressed his excitement as only Brian Wilson can.

"Well, I'm a pretty big America fan ... red, white and Dodger blue, I guess."

The 31-year-old ex-San Francisco Giants pitcher says he's grateful to get another shot in the bigs after undergoing Tommy John surgery last April ... but insists he harbors no ill will toward his former team.

"I got much love for San Francisco. We had a good time. But there's nothing I can do ... they don't want me back."

When asked about the storied rivalry between the squads, Wilson explained, "I don't worry about rivalry, bro ... I just play baseball, you know."