A.Someone attractive from afar, but when you get close you see that said person is not as attractive as they appeared from a distance. B.ugly up close

Derived from the painter Claude Oscar Monet's artistic style.
Tai: Do you think she's pretty?
Cher: No, she's a full-on Monet.
Tai: What's a monet?
Cher: It's like a painting, see? From far away, it's OK, but up close, it's a big old mess. Let's ask a guy. Christian, what do you think of Amber?
Christian: Hagsville.
Cher: See?

Clueless (1996)
by Mike Losquadro October 29, 2006
When someone or something is a full on monet they are pretty from far away but ugly from up close

EX: someone seems nice or pretty but is not a very nice person(vice versa)

the saying comes from the ICONIC movie Clueless

Cher—who is pretty much like "as if"—tells her, "She's a full-on Monet," and Tai is all, like, definition please, so Cher elaborates, saying "It's like a painting, see. From far away it's okay, but up close it's a big ol' mess."
Full on monet means that someone is pretty from far away but ugly from up close.
by Lillaaaa April 8, 2018
usually a person that looks fine or normal from far away but when you look closer they’re not that put together.

ex: clueless 1:27:32
cher: ugh she’s a full-on monet!!
tai: a monet? what’s that?
cher: well it’s like a painting see? from far away it’s ok, but up close its a big old mess!!
by nightingale ;) iykyk February 10, 2021