Unfortunate; unpleasant. Being in a state of discomfort or unhappiness; miserable. Incompetent; inept.
but u can't mess with shitty cuz its someones name...shitty from YO!!! don't use the name in vain!!-Dinky
this note book looks shitty
you look shitty
"Shittie" was then adapted to rule out those who were not wanted/welcome at those future events. Of course, with all new slang, and the help of the internet, those with low self esteem felt that they were targeted by those non-shitties.
The rule of 'Shittie' is as follows:
-If you have to ask yourself if you're a shittie, then you are.