D.F.I.T. = Dumpster Fire in Training. (See definition for Dumpster Fire.)
Visual example: If you were to see a teenage girl walking down the street smoking the wrong end of a cigarette, with one flip flop and one fuzzy boot, short-shorts modified to reveal her entire uterus for the world, wearing ridiculously over-sized bedazzled sunglasses, 6 colors of jacked-up make up, a cut-up wife beater top, and evidence of recent substance abuse visible from a distance...
That chick is a total dumpster fire in training!
Guy 1: "Woah... dude! Did you see that train wreck that just walked by?"
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi