Used when someone arrives or acts too late for it to matter. The phrase mocks the Santa Hermandad, a rural police force established by the Catholic Monarchs in the 15th century who wore distinctive green sleeves. They were notorious for arriving at a scene only after the trouble was long over, making their presence useless. (The Santa Hermandad was an early Spanish peacekeeping group famously mocked for its lack of punctuality.)
We are already late, and now he says he is going to get ready. A buenas horas, mangas verdes!
A delay or the act of being late. (This refers to the local cultural tendency for things to start much later than the scheduled time, often called Bolivian time).
A failed attempt to imitate El Gobierno de la Mañana, the most popular radio show in the region. It features a group of journalists and a combative old lady who thinks that by yelling she possesses the absolute truth. It is a bunch of frustrated copycats who think they are hot shots and expect to be worshipped just for being on the radio. The only one spared from this label is former Foreign Minister Victor Gomez Berges, who refused to plagiarize the original program. (El Gobierno de la Mañana is a legendary, highly influential Dominican talk show).