Thank you. That's very Black of you.

A silly, light hearted compliment used in jest. Easily substitute other colours as appropriate for the situation.

Best used with people with a sense of humour as opposed to those who take everything seriously.

You walk in to a mainstream restaurant. The waiter tells you the special for the day is chicken and waffles.
You say with a smile, "Thank you. That's very Black of you."

Your boss gives you a raise, ditto.
You get a birthday card with money in it, ditto.
Your sibling offers to finish your chores, ditto.
Etc.

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