a trainee astronaut.
an enthusiast for space travel, typically a young person.
a person perceived as out of touch with reality, as though high on drugs.
My friends kid had this hat on the other day. She posted it on Facebook.
I then commented that I wanted to use it in a few pictures. So, during drop-off, she flung this thing into my van like a prop manager on 12 shots of espresso!
And today? I bring you....SPACE CADET!
PS: Don't do drugs, kids!