look up any word, like swoll:
 
1.
Species of extra terrestrial, sterile hybrid species, who collect haploid (eg sperm and ova) samples from a variety of DNA based species in the Milky Way Galaxy. In order to vary their gene pool, as they reproduce by cloning.

The sampling procedure involves placing donors into trance, then beaming themn aboard their crafts, and examining and obtaining samples, then returning said donors.
I read about Gray Aliens from a book called "Communion".
by Kerb November 27, 2004
 
2.
A gigantic headed grey skinned Alien. It has extremly large black eyes. They abduct alchoholics, so no one believes there story.
Much like Bill Gates!
" Oh, yeah, last night i WAS abducted!"
by Scott Methy July 18, 2003