Vanelity filter - what's that?

Question:Watch http://www.youtube.com/watch?v=o3vxdcblg... and fast forward to 02:30 minutes. What does Niles mean when he say 'vanelity filter'? I haven't been able to find that phrase anywhere on the web! I'd really appreciate it if someone could help out. Perhaps it's just a made-up word, but I hope it's not...

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