This is what you call a white guy who tries to act like an Asian. There is a high probability that he will try (usually with little success) to get with an Asian girl. Other indicators are that he will like anime, manga, and drive a ricer.
Look everyone, here comes Vanilla Rice with his riced-up civic. Pretty soon he'll be talking about Goku and stuff. And he's white, not Asian.
It's a song, you sex-obsessed idiots! A perfectly innocent Owl City song about a guy who misses his girlfriend (or perhaps even a platonic friend, it isn't clear). Stop trying to turn it into something dirty.
When he uses the term, "Vanilla Twilight", he is literally talking about the color of the sky:
I'll find repose in new ways
Though I haven't slept in two days
'Cause coldnostalgia chills me to the bone
But drenched in vanilla twilight
I'll sit on the front porch all night
Waist deep in thought because when
I think of you I don't feel so alone