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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".
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