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1) Greeting one's friends or co-workers from a distance using a fist bump. The air in between is the connection like WiFi.

2) The act of celebrating an accomplishment or task.
"What up Ray Ray?” “ What up E?!"

“Yo, Homie I got number one fantasy pick!” “Wi-Knuck!”
via giphy
by Apex Mane June 29, 2016
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