A condition in which the foreskin of the penis, once retracted, cannot return to its original location because the foreskin opening is too small to allow the glans to reenter the foreskin tube.

The foreskin remains trapped behind the groove of the sulcus between the shaft and the glans. This causes blood to pool in the veins behind the entrapment, leading to swelling and severe pain.

With lubrication, the glans can often be pushed back inside the foreskin tube. In some cases, medical attention is required to relieve the condition.