In the Simpson's episode, Marge Gamer, what does Marge mean when she says...?

Either a) to look up your own name on Google or b) to masturbate.

Without context, it’s hard to tell, but it’s clear she doesn’t mean looking herself up on google. It most likely means masturbating, but it could be a little less specific, and mean something like making googly eyes at yourself—in other words, just kind of being infatuated with yourself; a form of narcissism.

Marge is not the most tech-savvy person; rather old-fashioned in a lot of ways.
She also isn’t the most intellectual or philosophical/meta person, so I doubt it would be as abstract as @wundayatta speculates.

My money is on her thinking it was the new slang for solo sex.