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Used to describe someone with a under bite with braces.

Synonyms - Train, Rails, Subway, Train Track Deng.
The Milky Way Express goes across the Train Tracks.
via giphy
by Juan-Athan June 21, 2017
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2
The series of marks upon one's arm due to injection of heroin. When the marks run up and down someones arm, similar to the tracks of a train, they are said to have train tracks.
Watch out for Paul man, he's totally addicted. Train tracks all over his arm.
by mapaccio March 29, 2009
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3
That girl in the bar was pretty hot until she smiled...she had sushi caught in her train tracks...

Oh, really....braces?

Yep
by B. Hanback December 30, 2008
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4
n. when you have braces on the top and bottom row of your teeth, giving the wearer the look of having mini traintracks running through their mouth.

the gaps between your teeth are the bars and your braces are the tracks.
rebecca: guess who's getting traintracks?
courtney: who?
rebecca: simon! he's also going to the same orthodontist as me!
courtney: doesn't mei go to that one too?
rebecca: oh, whoops...
by Citronic September 26, 2007
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6
What the train rides on... a slang term for a woman who gets a train pulled on her, or has sex with one guy after another after another and so on and so forth.
She got gang-banged last night man ... she got rode like a traintrack.
by shomesomethin July 12, 2010
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7
when two bowls of marijuana are passed in opposite directions in a circle... and when the two bowls meet, the person has to train track them by hitting two pipes at once.
your traink tracks man
by haggardrobhaggard August 26, 2005
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