What is [your Mothers An Astronaut]?
'astronaut' = his mom was a spaced-out junkie/druggie so the guy or girl was born of a polluted womb, therefore being all f***ed/messed up.
Made famous, however not originated by, the movie "White Men Can't Jump."
~"If you could count you'd be an astronaut"
-"Hey Gary "your mothers an astronaut"
~"Leave my momma outta this"
-"Me sayin your mothers an astronaut is just another way of sayin' your all f***ed up"