To display an attitude that transcends bitchiness but falls short of C word like behavior. Twattitude is commonly displayed by women (and effeminate men) in office environments. Symptoms include: unnessecary sarcasm, deliberate ineptitude, and douche bag like facial expressions.
Tina needs to retard her twattitude before she gets an upgrade to C-class.
"Oh, dear. It appears that Mary has burned many more Catholics. What shalt we do, Arthur?"
"I suggest we throw that Fucking twatticus into a lake, see how she likes it"
when someones outlook crosses the line from simply 'bad', to 'upsetting' to 'upsettingly bad'. Thus there is only one explaination; BAD TWATTITUDE. (Bad attitude+general twattery)
Teacher: I sent Darren home yesterday for having a bad twattitude.
Darrens' mother: why was that?
Teacher: you should know you raised him you TWAT.