One who purports to know more than he/she actually does. A false intellectual. Fintos tend to be hipsters, scenesters and or college students studying post modernism or "Po-mo" for short. They enjoy talking about "underground" indie bands as well. They also tend to cling to geek-chic with thick rimmed glasses so as to appear more intellectual.
"Wow. Look at that chick. With her book on post femininism, her deck clothes, and horn-rimmed glasses. She looks like such a finto."
"That's singer songwriter Lisa Loeb"
"Oh. That's deck I guess"