Payback's a bitch American spoken language informal
Don't rush to celebrate, payback's a bitch.
Don't do something bad to someone and think you will benefit from it. Payback's a bitch.
A humorous way of saying that what one has said is just what they acknowledge and may not be entirely accurate
Mike: Have you returned from your vacation on the beach? Your skin seems to get tanned.
Jenny: My skin is always dark. That's my story and I'm sticking to it!