This means to miss going to somewhere that you were expected, and is commonly used to mean not going to work or school. There are various ideas of where the expression originated. The Urban Dictionary thinks it is probably from the Dutch word hoekje, which is their term for a hide and seek game that had players searching for a hidden object. Schoolchildren began using “hooky” to mean skipping school in the nineteenth century. Another less likely possibility is that the term originated with the verb hook, which means “to steal.”