According to Georgia's GlossaryEdit

A woman in a magazine who gives you advice if you are a sad person with no one else to talk to. For instance, Jas might write, "Dear Agony Aunt, My friend Georgia is so much better looking, cleverer and all-round more brilliant that I feel inadequate. What should I do?" And the agony aunt would write back, "Kill yourself." (Not really, that last bit is a joke.)