I don't rightly know
A total lie that people tell when they're too lazy to actually think. It’s like saying you're smart but you're not.
'What's your name?' 'I don't rightly know. I was too busy thinking about my dog.'
'What's your job?' 'I don't rightly know. I was too busy being a dolt.'
'What's your favorite food?' 'I don't rightly know. I was too busy eating chips.'