I thanx nada
A sassy way of saying no, with extra attitude and a hint of disrespect.
'Do you want to go to the movies?' 'I thanx nada, I'd rather watch your face melt.'
'Can I have some cake?' 'I thanx nada, I'm saving it for your funeral.'
'Are you going to clean your room?' 'I thanx nada, I'm busy being a mess.'