TMTH abbreviated for TO MUCH TO HANDLE, first used exclusively by homosexual males in southern California frequently, now frequently used by many people of many different "categories".
TMTH can be used to describe something or someone negativity OR positively.
*Mattie is listening to Brittny's new album loudly while dancing sexualy*
Daphne:"Mattie you're being a little TMTH tonight."
*A kickback has been cancled after a group traveled 50 miles to reach it, the group arives and is informed*
Michelly:"This kickback is the definition of TMTH."