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1.
a funky, musical, soulful, sometimes "out-there" person, not necessarily, but usually of the african-american race
george clinton and his afronauts were gettin their funk on in the 70s
by tetrad field December 05, 2007
 
2.
An african who has been in space.
Even though he's technically caucasian, Mark Shuttleworth was the first afronaut in space.
by Pascal Desjardins October 30, 2010