When someone is being an asshole, or has just performed an action that was of morally questionable nature. A very versatile phrase; can be used in a wide variety of situations. It is mostly used in a lighthearted manner. However, if something extremely questionable has been done, and the phrase is uttered, it carries much more weight.
Your friend Tyler keeps kicking your ass in COD, and you are getting frustrated. The next time you are killed, you exclaim:
"Tyler, you a nigga for that one!"

One of your classmates, Ethan, has just taken food right off of your plate, and has immediately started eating it.

"Ethan, you a nigga for that one!"
by trustmeimanigga December 2, 2019
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