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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When you rub your dick between the vagina lips, without ever sticking it in the actual vagina.
Wow, so Kevin's girlfriend Chelsea won't have sex with him? That's fucking gay.

Yeah, but at least he is train tracking her.
by Apt. 42 November 28, 2009
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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 31, 2009
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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.
by Juan-Athan June 22, 2017
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A massive ladder that you lay down on, waiting for the train to come and run over you and your best friend rejects you because you look ugly as heck.
My friend looks stupid, he said he got ran over by train tracks, but really he just had no beauty.
by SillySalleh December 25, 2021
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