Paraculo is simply like this: do you know someone who do his best to "cover his ass" in any situation, even if this attitude could damage other people ?
this is a paraculo. A typical unresponsible person, selfish and opportunist
As far as I am concerned, I hate those kind of people
Yes and no. As a matter of fact,

"paraculo" is one of those terms the meaning of which depends hugely on a) the context and b) the speaker's real intention/feelings. Kind of like the English

"bastard" the word has negative/offensive meaning per se, but it can - and will - often be made to fit into positive/appreciative descriptions.
If someone calls you a "bastard" we know that, by default, he disapproves of you. In such cases, greenfield's definition of "paraculo" is perfect, with the only caveat that the term is also used rather loosely, to fit the general idea of an

"ass", or a "son of a bitch"
However, a friend can call you "bastard" or "son of a bitch" in an appreciative way, if he has a satisfied grin on his face or he's patting your shoulder while he does so. In that case, you are a "clever bastard", and depending on the context, it might very well be meant as a compliment. When that happens, "paraculo" defines the resorceful, witty person who is especially good with words, cutting remarks et cetera. The fact that the sharpest and most amusing comments are almost always made at someone else's expenses - sad truth that it is - is purely coincidental.
I get called "paraculo" a lot, and it is rarely my interlocutor's wish to stigmatize me as a

"selfish, irresponsible son of a bitch"
Over and out.
