And you thought that Taco Bell invented fourthmeal

  Here in Argentina, breakfast, lunch, and dinner are all valid meals that are often eaten, in fact daily.  Granted, the timing of these meals may differ a little from the States, but they are pretty similar.  
  Here's the difference: lunch is a little later in Argentina: about 1 o'clock or so. Then, dinner isn't until 10:30, or later, depending on the day.
  So, your first reaction is probably, "10:30!? that's really late!"  But your second reaction should be, especially if your a teenager, "That's a long time between 1 and 10!!" 
  That is why we have "merienda" or "leche."  It is a snack somewhere in the vicinity of 5:00, but that's as subjective as you want it to be. It consists of coffee, tea, or maté (typical Argentine bitter tea drink) usually with milk and some type of bread or crackers, snack-type stuff.  Of course, I can't speak for everyone in Argentina, but this is the way we do it at our house.