When the male genetalia, including a fully erect penis and all scrotal contents, are stuffed into one regular size (no Magnums allowed) condom. This is best performed in facilitation of the two dogs in a bathtub maneuver.
Sally was originally unimpressed with Joes sexual prowess until he performed the San Antonio Submariner in her presence.
For years Billy had been unable to master the way of the two dogs in a bathtub, until he discovered the San Antonio Submariner. Although conquering one feat, he was soon crushed under the immense pressure of the other.