When three men stand in a circle and jerk off the gentleman to their right.
Why does it take 3 networking guys to install a switch? These guys are so lazy. With all three of them in the network closet like that, I'll bet they are giving each other a 3 way handshake.
When you and 2 of your buddies celebrate a good game of darts, and you do a “3-way knuck”. A fist bump between 3. A rare simultaneous connection of knuckles felt between each individual.
After our game of countdown, we did a 3-way knuck to celebrate the game.