When a person has taken on the mannerisms, political viewpoints, and actions of a hippie/new age activist. Extremely liberal in their views, these people will claim to "fight the system" all the while just sitting around complaining.
John: Dude, Jim's been going to a lot of protest rallies this year.
Steve: Yeah, he's gone granola.
Larry: Anymore, when I talk to Bob he always complains about the "capitalist machine." What's up with that?
Ed: He's gone granola...