cockshroud

The foreskin of the cock, especially a long one that sticks out over the cockhead in kind of pucker, or a very wrinkly one.

Tim wouldn't skinny-dip with us at the pond because last time he showed his cock around other guys they made fun of his wrinkly foreskin. They pulled it over the head of his dick and shouted, "Dudes, look! A cockshroud!"