A crooked vein is an uncut dick, so called because of the prominent vein that runs the length of an uncircumcised penis, branching into two smaller veins at the foreskin.
1. When that studly guy took off his pants and underwear in the locker room, he displayed a magnificent crooked vein.
2. That stud seemed to parade around the locker room to show off his crooked vein.
2. Did you see the crooked vein on that stud?