Toilet/WC based game involing 2 people (intimate)
One person sits on the toilet whilst another person straddles them. The first person dumps his/her first ship (feces). The second person then has to try and target the first ship. If successful that person lets out the exclamation "You sank my straddleship!" The game continues until all ships are sunk or bad wind forces a stalemate.
"Me and the missus had a wicked game of straddleships last night... I was a little bit ill so it was more like napalm"