Vacas means “cows”, but it is the shortened, slang word for “vacaciones”, holidays.
July and August are the big summer holidays in Spain, especially August, when the beaches in the South and East get completely “atiborradas” – PACKED – ¨hasta los topes¨ (to the brim). Small businesses close down, so don’t despair too much if you see the sign “CERRADO POR VACACIONES.”
We all like to take our holidays at the same time as everyone else. If not, we might get some peace and quiet – and what is the point in that?
(For an example on how “vacas” is used, check out Tomasee’s blog.)