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1.
v - to drop from a difficult major like engineering or a science and switch to mangement.

See also Tech Trolley
Most of my friends dropped Computer Science and hopped on the old M-train.
by Anonymous November 05, 2003
 
2.
a girl's period.
she's crazy, and to make it worse, her m-train hasn't come yet...let's ditch her and egg some random persons house because we're brainless idiots!
by dude...somebody knows! November 06, 2003