What is Tunneling?
1.
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.
2.
when one man places his foreskin over another mans penis, hence becoming a tunnel.
Sid and Frank, were tunneling one night together
See
3.
getting some between a voluptuous pair of knockers.
safe sex by avoiding orifices and the exchange of body fluids.
Jimmy chose to avoid disease by tunneling his rod between Sally's massive breasts.