Green’s Dictionary of Slang

MTM n.

[abbr. male to male, var. on FTM n., with the idea being that although the person was biologically a woman to start with they always felt like a man]

(US gay) a female to male transsexual.

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[US]R. Scott Rebecca’s Dict. of Queer Sl. 🌐 MTM — Male to Male. Some female to male transsexuals dislike the term FTM, because they feel that they were never female, and were always male, and that all this surgery is merely cosmetic, to make it clear to everyone else that they are male.