The line between being friends and being lovers. If you become close friends first if one friend has feelings for the other and the other person just wants to keep it the way it was.

from the song Thin Line by Jurassic 5 featuring Nelly Furtado.
"please respect the thin line"
by thecopsdaughter September 29, 2008
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When you think you have sweet fart, but it turns out to be a shart
Hey man I thought had a sweet fart, but when I let it rip it turned out to be a little shit. That's the thin brown line for ya
by Ddawg1990 January 20, 2018
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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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1)The crevice of a girl's vagina seen from the outside of her underwear. Also known as camel-toe.

2) A WW2 movie from 1998 directed by Terrence Malick.
1) John: "I saw Sirah's thin red line as she got out of the pool, it was sexy."

2) John: "I watched the Thin Red Line on TNT yesterday."
by neineinein329 June 27, 2015
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The level of technology that exists in a society which is sufficient enough to absorb a degree of antisocial behavor that would have historically resulted in complete social destruction.
Human A: There are so many people on earth that are reprobates and borderline criminals who can't even support themselves... and so few police...

Human B: Yeah but we have TV, mass produced food, internet, games, cars, cell phones, and all vital services delivered...

Human C: Ah yes, the Thin Chrome Line.
by miragez January 25, 2011
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Thin Red Line is another negative adjective such as piece of crap, POS, HUD, etc. Its derivation is from the Terrence Malik travesty of the same name.
Wow, the Cubs sure suck. They're nothing but a Thin Red Line.

or

Eating at that restaurant made me vomit for hours. It was so Thin Red Line.
by westudi September 28, 2006
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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 1, 2003
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