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1.
1. A version of "pretty" or "handsome" that works for everybody.

2. Someone who is pretty in a very generic way.
They may be generally agreed upon (in their culture) as pretty or handsome, but they do not stand out in any way. There is nothing striking about their beauty.

If you were to do a composite of all the features men or women find to be attractive and create a computer-generated image of it, this is who would pop out.

The term comes from the idea that catalog and underwear models must not overpower the clothing that they wear and thus those who cast them pick the most mainstream-looking of the models. Consequently, underwear models all look very similar to one another in a very striking way.
Girl 1: I am soooo in love with George Clooney!

Girl 2: Why is everybody so hot on him? He looks like an underwear model. Mark Walhberg is so much better-looking.

Girl 1: Oh come on! He really was an underwear model!

Girl 2: The irony!
by Surprised January 15, 2009