Yeah, if I have to hide jacked up looking hair in a ponytail, bun, braid, banana clip or claw clip, it's not second day hair.

To me, second day hair means it looks good when I shake it out in the morning and doesn't require hiding or a lot of work.

If you purposely wash and prepare your hair at night for the following day, then that's not really second day hair; that's just your daily hair routine.