OCD after a priest's name stands for "Order of Discalced Carmelites." The Discalced Carmelites, also known as the Barefoot Carmelites, are a Roman Catholic religious order of friars and nuns. The term "discalced" refers to their practice of wearing sandals or going barefoot as a sign of simplicity and poverty.
Carmelites trace their roots back to a group of hermits on Mount Carmel in the Holy Land during the 12th century. The order was reformed in the 16th century by Saint Teresa of Ávila and Saint John of the Cross, leading to the establishment of the Discalced Carmelites.
When a priest is affiliated with this particular order, they may use the initials "OCD" after their name to indicate their membership and devotion to the charism and spirituality of the Discalced Carmelites.