The attractiveness that one may have for being intellectual. Characterized by goofy but cute looks, off-beat interests, above average intelligence, and a sweet and caring personality. A sense of attractiveness which is derived chiefly from personality and less from aesthetics.
"Hey Lafonda...that boy know all about politics!"
"Aw and with his cute little smile...what nerd appeal!"
"That boy in our economics class has some serious nerd appeal."
"I know right?! He gets 100% in our class...and he totally held the door for me the other day."