3 definitions by New Brunswick Station (subchat)

Top Definition
To die by jumping in front of an oncoming train. Comes from a combination of New York City subway code for "person under train" (12-9) and shorthand for "yourself" ("12-9 yourself"). Suggestion of how a person "ought to be killed" when one is annoyed with the other person. Similar in meaning to DIAF and DIAT. In other words: "shut up".
"Shut up, DIAF, and 12-9ys, moron. You have flamed enough for the both of us!"
When underpaid transit workers attempt to get their way by not working, therefore screwing everyone working/living/playing in town
The recent transit strike made me walk across the Brooklyn Bridge!... This fucking transit strike fouled up the Green and Market-Frankford lines. Can I have a taxi, please?
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