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
Top Definition
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 July 08, 2015
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