Before I get into what To a T is, you've gotta play the trailer above, because the song is sublime. It has the same effect on me as a sincere compliment from a stranger.
The premise of To a T, which you might gather from the trailer (or maybe not, there's a kind of lot going on), is that you're a kid whose arms are always sticking out. The T-pose is a default pose in the 3D modeling world, and game characters have been known to get stuck in it due to glitches. In this case, it's just the "extraordinary posture" of the protagonist, a teenager named Teen.
