Heard this term recently on Insecure with Issa Rae. It seems to refer to a friend of one's parents or family. Someone who is part of the family, but not an actual relative. Different from a "playground uncle". Used the way those in Asian communities sometimes refer to their parent's friends as "auntie"
Come over and meet my play uncle--he's been around since I was 5
by Fandelaspalabras February 8, 2019
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