A prostitute that work either the Lincoln or Holland tunnels on the Manhattan side who are frequented by drunk Jersey idiots.
Bro, I was out having a smoke outside the Westside Storage Yard where I saw some Jersey guy crying because the Tunnelbunnys snatched his wallet when she was milking him!
When two gay men share a chronic addiction to anal fornication. Habituation of anal sex will eventually scar one's anus, marking one as a permanent "Tunnel-buddy."
If your friend has a girlfriend, and his girlfriend slept with his sister, and you sleep with his sister. you are now Bluetooth Tunnel Buddies with your friend