To have sexual intercourse on a beach and get sand on and around your penis.
This often leads to serious chaffing of the penis and vagina. The cause is primarily poor blanket positioning and/or when you withdrawl and go for the vagina again you miss driving your penis into the sand.
Holy fuck, my cock is totally raw I Sand Fucked Myra the other night at the beach.
When you fail at something in life (eg. failing an exam or not getting a job), go home and spend an hour just standing in the shower, propping yourself up against the wall with your eyes on your feet.
Caleb knew the only thing to do after he didnt get prefect was take a failure shower.