A variant of the donkey punch. Scuttling the ship is the act of having sex with your partner (male or female) in a pool or other large body of water, and seconds before the giver climaxes, they force the takers head under the water without warning. Similar to sinking the ship before the end of the battle, one can call this Scuttling the ship.
So last night I was totally baggin this chick but she just kept talking. We were in the pool and I decided to scuttle the ship. That shut her up.