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1.
A blue boy is a cops or any other law inforcement officers.
Man Dave Tezzy that party was bagging for show, until them blue boys showed up.
von Big Bing 26. Oktober 2005
 
2.
depending on the location it could be a crip(crab) (its mostly a crip) or a sureno(scrap) or somebody in a gang/clique that bangs blue

its also a famous painting by thomas gainsborough
this red boy ran up n threw up the blood sign and was pistol whipped by a blue boy

a blue boy got shot by a popo
von da_reaver 2. September 2006
 
3.
(n.) Slang term for cop.
"Stay where you are, blueboy!" (during a robbery)
von Paolo C 9. März 2006