Inserting a live animal through a tube into someone's anus. Rodents are mainly used. SEE "feltching"
Dave was really into tunneling, he had a favourite gerbil he liked to use.
by Jasvk May 5, 2003
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The Tunnel is how Coloradoans refer to the Eisenhower Tunnel, the highest vehicular tunnel in the world. It carries I-70 through the Continental Divide and through to the killer powder on the other side.

Usually used when talking about how long it's going to be until you shred the gnar.
"How long til we get to Vail, man? I can't wait to rip with my new board."

"At least an hour, we're not even to The Tunnel yet. Better light that blunt now."
by frank carter June 29, 2009
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A term used during gay sex when the man being penetrated excretes feces and the man initiating the penetration continues anyways.
"Yes Derrick keep tunneling me."

"Fuck he tunneled me so bad last night I can't even move."
by Jopsenig April 5, 2016
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1. To become embaressed after doing something stupid or making a mistake.
2. A feeling right before doing something uncomfortable
He was in the "tunnel" when he had to meet his girlfriend's parents for the first time.

I was in the tunnel when I fell down in front of a huge crowd.
by Davea131 April 24, 2008
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when one man places his foreskin over another mans penis, hence becoming a tunnel.
Sid and Frank, were tunneling one night together
by steph_2207@hotmail.com May 13, 2007
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The act of having a threesome. The female is bent over and one male penetrates the anus and the other male has oral sex. Then the two male high five with both hands extending out creating a tunnel.
yo bro we should tunnel that girl
We tunneled this girl last night it was a great
by LittleDaggerDick February 27, 2017
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The act of inserting a snake into a man and or woman's anus for sexual gratification.
Guy1: Hey dude last night I tunneled a chick in church.

Guy2: Oh yeah, one time I tunneled a dude on an airplane.
by lemonjello612 July 8, 2011
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