Navy term for the seagulls that land on the grinder/blacktop that you march on.
In the chowhall you sometimes are served cornish hen, some new recruits have never seen a cornish hen and you tell them it's grinder bird.
Seaman Johnson: These are the smallest chickens I have ever seen.
Seaman Morris: Thats not chicken it's grinder bird.
by Jolly Roger March 25, 2004

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