MTH stands for "Multi-Talented Homeboy". It is used to describe a cool, funny, and talented person. He has a great taste in music, has a bunch of friends, and has great hair. The girls love him.
"Dude, do you see that guy playing guitar and singing for those girls over there?"
"Yeah, dude's a total MTH"
My Tits Hurt.
This word is to be used after working out or performing any activitiy that can make the pectoral muscles burn excessively.
DB#1: Bro, I just put up 500 lbs 6 million times, MTH.
DB#2: What is MTH?
DB#1: It means my tits hurt
DB#2: You're a douche