I Be Swimming - It's a black person's way of saying 'I'm doing my thing, and

It's a black person's way of saying 'I'm doing my thing, and you ain't.'

My cousin said, 'I be swimming in this game, you ain't even playing.'

My homie texted me, 'I be swimming in this situation, you're just here.'

My mom said, 'I be swimming in this life, you're still in the womb.'