It can basically mean both good or bad depending on the way you use it. it's like saying gay if it's "bad" without using that word. Or if your friend has a new game or hot shirt from a band with it's signature can be called "sicktits".
It was basically made when someone slurred the words "sicko" and "attitude" together.
the aptitude you have while slacking; the aptitude of a slacker
sloathfulness, or carelessness while learning;the ability to learn (or not)and still slack
"The slacktitude that got me into AP Chemistry was the same slacktitude that got me kicked out of AP Literature in HighSchool."
...
"Hey Coomer, can you work a little faster!? we are in a war..."
"Hey Sir, I'm working to the best of my Slacktitude, I think I have mTBI or PTSD :-P"
"I think you just lost your god given givashittery soldier"