Terms I've learned this weekend:

"Coco vacía" - literally, empty coconut; figuratively, when you expect to receive something good but there's nothing in it. (Also for when your home's been gutted.)

"Un canalla" - a degraded person, but the key here is that this is the nastiest thing one might say in *polite, political company*. There are plenty of worse words, but this one is used to accuse another public figure of being a disreputable POS without being seen as vulgar oneself. #ContextIsKey!