Top Definition
Sexual activity between a human and an extraterrestrial being. To include intercourse, masturbation, cunnilingus, frottage (rubbing), anal penetration, or having ones genitals licked by an alien or vice versa.
It was totally extraterrestriality when Katy Perry had sex with that albino black guy at the end of the "E.T." video
by SpaceBalls69 October 24, 2011
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