The same concept as the game tunnelball but where one lucky participant rolls down the tunnel on a skateboard and gets dunked by everyone's ballsack.
1. Everyone line up Nara wants to play tunnel teabag
2. Adam always wanted to be first in the tunnel teabag
3. My nads got chaffing from a marathon tunnel teabag
by EvLovesGoldenRivets November 20, 2018
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Can be an initation rite or punishment:

at least ten guys need to crouch in a line letting their balls hang out, the new guy or dude who needs to be punished is dragged underneath the tunnel and will get a faceful of ballsacks. Voila, it's the teabag tunnel.
Moron: "I want to be in your crew, man! Leader: "Sure, but first you must complete the teabag tunnel!"
by dschoean February 1, 2018
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