Blaine is the rich, '
dreamy' character played by
Andrew Macarthy in
Pretty in Pink.
Fond of wearing white suits with pink t-shirts underneath.
Supposedly the romantic hero to Molly Ringwald's heroine but his role is completely overshadowed by the well groovy Duckie, who in the original cut of the film ended up with Molly at the Prom at the end of the film.
The term can also be wittily used to describe someone who is tragically uncool in their pursuit of zeitgeisty hipness (ala the tendency for the Miami Vice look for the character in the film).
"Blaine? His name is Blaine? That's a major appliance, that's not a name!!" - DUCKIE.