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1.
An interjection similar to "get lost" or "quit it"

Entomology: Comes from a story on TardBlog where a retarded boy eats an embryonic bird and later exclaims "eat bird" - it's usage, however, has little to do with the entomology.
Random guy: Hey baby, let's see those tits!
Girl: Eat bird.
by Clive Braddock June 09, 2005
 
2.
An interjection similar to "get lost" or "quit it"

Entomology: Comes from a story on TardBlog where a retarded boy eats an embryonic bird and later exclaims "eat bird" - it's usage, however, has little to do with the entomology.
Random guy: Hey baby, let's see those tits!
Girl: Eat bird.
by Clive Braddock June 22, 2005