A'course - A word that comes out of your mouth when you're too lazy to

A word that comes out of your mouth when you're too lazy to explain why you're right and everyone else is wrong.

A'course I passed the test. You're just the one who cried during the exam.

A'course I'm the best. You're just the one who forgot to bring the snacks.

A'course I’m the main character. You're just the sidekick who got lost.