1 definition by Christopher Eccleston

A person, usually female, that is only attractive in a thumbnail image. This is similar to HFFA.
Josh is browsing on the Internet when he sees a thumbnail of a girl.
Josh: Oh, she's hot!
Josh clicks on the image
Josh: Shit, she's a thumbnail beauty!
Josh then proceeds to vomit all over the screen, probably in an attempt to shield his eyes from the girl's ugliness.
by Christopher Eccleston June 06, 2013

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