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1.
abriviation for more than i should
i love you mtyk (more than you know) mtis (more than i should)
by chloe cantelope November 16, 2008
 
2.
MTI
Military Training Instructor. The USAF's watered-down version of a an Army Drill Instructor. Don't say it to his face, though, because he'll still kick your ass six ways from Sunday.
"My MTI was all like 'WHAT THE PISS TRAINEE!'"
"Aw shit, MTI got his knife hand out! RUN!"

Trainee: "Sergeant, can I-"
MTI: "SIR, TRAINEE WHAT?! WHERE'S YOUR NOSE?"
Trainee: "On my face, sir..."
MTI: "Fucking get there before I ram my cock so far down your throat it pops out your ass!"
Trainee (pushing): "Up one, sir. Up two sir..."
by Nightverge July 05, 2012
 
3.
MTI
AKA M2I
adjective/noun

abbreviation denoting a male-to-intersexed transgender or transsexual person
MTIs may prefer to be addressed with gender-neutral pronouns, e.g., 's/he' and 'hir'.
by psychonomaly July 02, 2012