someone who is living like they were in another world like from outer space
Dude, here comes the space cadet , Houston we have a problem... Earth to space cadet come in for landing.
Meaning your out there in space, lost in the sauce, far out there as if you were a space cadet.
Player messing around in weight room:
Coach: SPACE CADET BOE!
An individual who is slow; spacey, a little to happy, off the ball, picked last, generally oblivious
Pay attention space rock. That space rock has no idea what's going on.
When someone Who is an Astronaut, Or A Worker at a Space Agency, or simply someone In Love with Space becomes a Yandere.
Have you heard that Alice is a Space Yandere?!