To call a guy John West is to imply that he will only go out with girls that meet his high standards.
The definition relates to the companies slogan, "It's the fish that John West rejects that makes John West, the best." Which if you consider the girl to be the fish then this is similar to a guy with high standards rejecting girls that don't meet them because he only accepts the best.
Sophie: Hey, Tom would you like to go out with me?
Tom: No thanks Sophie you don't meet my high standards.
Sam: Haha, Tom, Sophie's pretty hot I'm going to call you John West.
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