Something akin to a nerd; someone who is very unhip and also oblivious to the fact that they are. Like a guy wearing shorts and black socks with a camera hanging from his neck walking around Disneyworld with his twitty wife and twit kids.
"Did you see that twit?" As a man walks along a city sidewalk, he stops at every singlebicycle chained along his way and slowly bends down and sniffs the seat of each one.