Definitions by Christopher Eccleston

Thumbnail Beauty

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.

Thumbnail Beauty by Christopher Eccleston June 6, 2013