An abbreviation used to compel another pokemon player to "Make their own damn team!." Not necessarily exclusive to pokemon.
This phrase is known to originate in competitive pokemon. Often on pokemon discussion forums threads will be created to ask for help in building a pokemon team. Frustrated veterans will often simply post MYODT if they don't feel like helping or if the topic creator is becoming difficult.
Hey guys, could you help me make my team?
Poster 1: Hell no, I don't have time for this...
Poster 2: MYODT, n00b.
Poster 3: My milktank brings all da boys to da yard.
Topic Creator: Okay, I'll try for myself guys. :(