I came across that term on another Catholic blog. The question posed dealt with whether or not "Novus Ordo priests" would have the same courage of the Mexican martyr priests during the Mexican revolution.
I find the question offensive. First of all, because any Roman Catholic priest deserves to be respected as a Roman Catholic priest regardless of which form of Mass he celebrates. Indeed, every priest ordained in communion with Rome is a Novus Ordo priest since the Ordinary form of Mass, the Mass of Paul VI, is the ordinary form of Mass.
Secondly, to question a priest's orthodoxy or fidelity based upon which form of Mass he celebrates, or whether or not he uses Latin, is an offense to the Holy Father and the Magisterium, the Sacred Vatican Council, the Sacrament of Holy Orders as well as the Mexican Martyrs who gave their life for the Church in our day.
This type of foolishness is what annoys me most about the overly pious, sanctimonious, elitist traditionalists, and those who play to them.
Image: Fr. Miguel de la Mora de la Mora and Companions. Source