[yea boi] Share definition Flag a phrase used in extreme excitement or happiness "I finally aced a test, yea boi!" (while stuffing a shot during basketball) YEA BOI!!! [yea boi] by L-to-the-I-to-the-IZ June 16, 2006 0 0 Get merch Get the [yea boi] mug. Buy Now — $32.95 See more merch