grey alien
noun
University
1
An archetypical humanoid alien, usually described as having grey skin, elongated, hairless, sexless features, and a large head with bulbous black eyes; chiefly associated with flying saucers, alien abductions and conspiracy theories relating to cover-ups by the United States government, such as Area 51.
2
Used other than figuratively or idiomatically: see grey, alien.
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