rusty surfboard

1. When a surfer has the runs/explosive diarrhea and is waiting for the next set (of waves) too far from the beach to make it to a bathroom and "let's it go" while sitting on his or her board

2. A sex act where two wangs or sex toys are simultaneously inserted into a butt at angles so they come together in a point past the sphincter and the two wieners or dildos outline the shape of the front of a surfboard