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Tunnel sand

Tunnel sand is a type of sand that a railway/railroad tunnel will produce organically. In the past, tunnel sand has proven to be quite explosive in nature which is triggered by the act of a locomotive entering any tunnel that is producing tunnel sand. Tunnel sand is also the type of sand that is widely used in children's sandboxes in playgrounds.

Gee whizz, I sure hope this tunnel sand doesn't explode.

by letmesubmitanamealready May 11, 2017


tranny tunnel

A tranny tunnel is what you get when a man, in pursuit of becoming a woman, splits his penis like a banana peel and folds it inside out into a wound that constantly tries to close itself.

Alternatively, it is the path for a transmission to be routed.

Tom needs to hit up the dilatation station for maintenance on his tranny tunnel.

by RichtersAwful December 5, 2018


Quantum Tunneling

Quantum tunneling refers to the phenomenon in quantum mechanics where a particle has a finite probability of crossing through an energy barrier or potential barrier despite lacking the necessary energy to overcome it based on classical physics. This behavior arises due to the wave-like nature of particles at the quantum level. Quantum tunneling allows particles to "tunnel" through barriers, enabling them to reach regions that would be classically inaccessible.

"In quantum computing, qubits can exploit quantum tunneling to tunnel through energy barriers, facilitating more efficient computation processes."

by F L P May 16, 2023


Aggressive Tunneling

Quick rough anal sex with your partner

Bob and I did some aggressive tunneling while the baby was napping today.

by BillardGuy May 20, 2020


French Tunnel

When a male sits naked on top of their naked partner and farts directly into their butthole, this creating a “French Tunnel” effect

Had some really great sex and afterwards gave her a massage, and in the middle of the massage I gave her a surprise French Tunnel , she was mortified

by FrenchTunneler August 1, 2023


tunnel vision

1. What Mr. Happy has (i.e., his "vision" is always focusing on just one thing --- specifically, a gal's "love-tunnel").
2. What the vengeful and intently-gazing-straight-ahead Biff Tannen was experiencing while trying to run down Marty McFly in the underground causeway, and therefore he never noticed Old Man Jones' fertilizer-truck in time to avoid colliding with it --- yet again --- and consequently having himself and his car covered with the truck's messy contents ("MANURE!! I hate MANURE!") a second time, mere hours after having gotten said beloved jalopy back from Terry's garage which had cleaned it out from its previous encounter with said poop-hauler.

I always slow down a bit and drive extra-carefully through mountain-tubes and other underground traffic-passes, since it's notoriously easy to unwittingly get "tunnel vision" when traversing said claustrophobic motoring-routes.

by QuacksO April 7, 2020


Bum Tunnel

The term used when two people of any sex create a tunnel by pressing their bare bum cheeks together, usually for the purpose of a third male party to insert their penis for sexual pleasure.

“Ryan rang at lunchtime to invite Mike and i round tonight for a bum tunnel and a curry

George “Would you like my wife and I to bum tunnel you?

Me “no”

by Leviathan Porkchop June 25, 2021