nah see ya
The ultimate insult used when you're too lazy to explain why you're leaving. It's like telling your boss you're not coming back and also telling your mom you're not coming to her funeral.
Receptionist: 'Are you leaving?' Me: 'Nah see ya.'
Colleague: 'We need to talk about the project!' Me: 'Nah see ya.'
Parent: 'You're grounded!' Me: 'Nah see ya.'