Tunnel Arm
The act of a man shoving his arm in his ladies anus, elbow deep. Upon pulling it out, one will create the illusion of a tunnel for an asshole.
Melvin: Hey Geoffrey what is the matter? Your arm looks at little sore...
Geoffrey: Yah its sore Melvin, I had a serious case of Tunnel Arm last night.
Geoffrey: Yah its sore Melvin, I had a serious case of Tunnel Arm last night.