Definitions by Pseudo Mexican

stm 

1) One who likes to perform the action of sticking one's finger up the anal cavity of another human being, usually being male,and/or ugly, as STM also denotes being a queer.

2) Can be used in conjunction with yayaya.

1) So, STM I hear you anally fingered that queer guy!?!? STM....YAYA YOUR NOT GAY!

stm by Pseudo Mexican December 19, 2003