UK useage.

The police in an area notorius for it's highcrime rate eg Whitechapel in East London, The Barton Hill area of Bristol, Bootle in Liverpool, the cornish town of Bude etc.

So called because said police see themselves as the only thing preventing an out break of anarchy
With 19 muggings, 34 assaults, 4 street fights, 7 car jackings, a rape, a murder and only 6 police the thin blue line is being streached tonight.
by black flag June 2, 2004
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Crushed up 10mg pills of methylphenidate, commonly prescribed at Ritalin. 10mg pills are commonly prescribed to treat ADHD and are coloured blue. The rit is crushed, and arranged into lines in order to be snorted. This gives the user a pleasant rush.
by Marcellus October 14, 2004
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Blue Line Special is a southern adjective, noun, and verb. It is insert-able wherever you want it to be, and is usually applied to situations where the speaker is unable to come up with a real word.
mmnmmmhm. we didn't go camping this weekend. thats pretty blue line special.

JD got a 100% on the test. Thats blue line special to the fullest.

I got that blue line special on that blue line special.
by Mr. Blue Line January 29, 2012
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the banding of all cops in any state despite right or wrong. The reason why NYC police only have cameras in their highway cars
All police rely on the thin blue line
by Anonymous November 2, 2003
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The Blue Line gang is one of the most violent and dangerous gangs operating in the United States of America. The code of conduct dictates that "snitches het stitiches" and misconduct of fellow gang members should be covered up whenever possible. Members of law enforcement who do not join the Blue Line gang are often retaliated against and forced from the profession.
"Did you hear about how a Blue Line gang member shot and killed an innocent man for excercising his constitionally guaranteed rights?"

"Yeah, I read that his fellow Blue Line gang members investigated the incident and found that the Blue Line gang member acted appropriately. The murderer was rewarded with a paid vacation and later promoted to captain."
by FreedomLovingPatriotMan October 27, 2023
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2 blue lines is another meaning for pregnant, because on a pregnancy test, 2 blue lines is positive.
"I got 2 blue lines! Can't wait to tell people"
by Zainab.H January 27, 2017
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Similar to crack head energy, gives you an uneasy feeling as if you had encountered them on the last train downtown
"Did you see that chick arguing with a orange!"
"Yeah she had strong blue line energy!"
by Alternate name December 20, 2019
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