The act of inserting a funnel into ones anus, whilst shitting through it into another persons mouth, straining the nutrients and waterier contents of
the shit. Variations may involve
the addition of a liquid such as urine for easier
consumption.
Person 1: Fuck dude, I'm feeling so queazy
right now, I think my shitters gonna blow.
Person 2: Well don't just waste it in your undies dude, want to do a Tunnel Funnel?
Person 1: I'm down for a good old Tunnel Funnel.
Thanks man, your the best
older brother ever.