thin line 

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"

thin line by thecopsdaughter January 17, 2009

Thin Line Friendship

Being friends with someone who has completely different views over everything.

Mary and Joe have a Thin Line Friendship

Thin Line Friendship by disturb May 10, 2021

thin brown line 

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

thin brown line by Ddawg1990 January 21, 2018

Thin blue line 

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.

Thin blue line by black flag June 2, 2004

thin gay line

The midpoint line on the Tate scale which separates flirting with homosexuality from actual, gay sexual contact.

The Tate Scale, named after Internet celebrity Andrew Tate, is a logarithmic scale from 0-1 which measures the gradient of homosexuality in a person or activity.

Any measurement on the Tate Scale approaching 0.5 is, definitionally, the Thin Gay Line.

"My friend wanted me to go rollerblading with him on the beach, but that's just too close to the thin gay line for me."

thin gay line by slappy hooper October 15, 2022

Thin Red Line 

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."

Thin Red Line by neineinein329 July 8, 2015

The Thin Chrome Line 

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.

The Thin Chrome Line by miragez January 25, 2011