When you kick someone so hard in the ass your foot goes straight in.
"Kirsten watch out..unless you want a good tunneling"
by namelesswoman September 06, 2011
When you beer bong an entire beer through your anus.
"I'm so drunk, I was tunneling an entire beer earlier"
by beeraddict76 December 15, 2013
when one man places his foreskin over another mans penis, hence becoming a tunnel.
Sid and Frank, were tunneling one night together
by email@example.com May 12, 2007
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 05, 2003