When an adult male wears the foreskin from a circumcision like a fascinator on his penis. Usually done at the end of a Bris held on the same day as the Kentucky Derby. If a group of men do this a mockup of hobby horsing can be done displaying their talents and foreskin attributes.
This year at the Foreskin Derby I won best in show with a cutoff I found next to the dumpster at the children’s hospital!