Someone whos penis is so big, when it gets an erection, it seems to go into space, like an astronaut.
Once I took off his pants, I knew i had met a cock astronaut.
by His Airness Dos June 11, 2006
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One who cannot control when his penis becomes erect and resembles a rocket taking off into space.
Taco Terry met us at the strip club and walked around the club with a boner all night long, what an astronaut cock.
by Peachez-757-23336 November 28, 2017
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