I'm not a pilot either, but I'm fairly sure it is the former. I believe "attitude" refers to the angle of the plan with respect to horizontal (so pointing up or down very steeply is an "unusual attitude").

Attitude -- that would be, the alignment of the plane to the ground.

Attitude. An "unusual attitude" refers to the aircraft being in a configuration that is not normal in controlled flight (e.g., flying inverted). I think that's close to the FAA definition.