What is queso sincho?

Just a further note about El Becerrito, the closest food store to us in our neighborhood:

Veterans of the Westernathon may remember El Becerrito as the place where they stood around eating barbacoa de chivo and chicharron, across the street from and a little north of the Western Avenue Shrimp House. This was in March of 2003, before my Chowhound time, but I read about the whole overwhelming Western Avenue experience in this post by Mike G and the subsequent followups.