Pai - In Chinese, it's a lazy way to say 'bye', like you're too ti

In Chinese, it's a lazy way to say 'bye', like you're too tired to say the full word.

'Pai' is what my friend said when he left the party early.

I said 'Pai' to my mom when I got home at 1 AM.

He just said 'Pai' and left me hanging in the middle of a conversation.