When I was in a Mexican border town (near Pharr. Texas), we had this partically deliscious concoction served to us from a street food vendor, I want to know what it's called?

Corn cut right off of the cob was in a cup, with some crumbled white cheese of some sort over top, and a bit of hot sauce. Does anyone know what it is called? I got to wash it down with the best margarita I had ever had..