It is not a term I've heard before but this morning I've come across it again in Gavin Esler's report from Argentina; in Buenos Aires, apparently, 'Cara de Queso' is a term of abuse, but he does not say why.
Otherwise I see from the report that Buenos Aires has not changed much since I was there two years ago. It is a place of extremes, perhaps more than most capital cities - the very affluent living alongside the very poor. For instance I looked up from my breakfast through the huge sheets of glass in my luxury hotel one morning and saw a woman sheltering in the doorway of a church, a baby in her lap - she had obviously been there all night. Then returning from a tango show at 1 am my taxi was stopped in the middle of the city by traffic lights and children suddenly appeared in the front of the car juggling and then their friends tapping at the windows for money. During the day the city seemed prosperous, vibrant and cultured (although edgy especially at the airport - and I was warned to take particular care both here and at the bus stations) it was only at night the other side of Buenos Aires seemed to come to life.