Among the various contributions that appear here I think that all the meanings are already covered. Even so, I take this opportunity to clarify some misconception: it is not that 'sieso' is something of little value; is that the phrase "I care about a sieso" is interpreted as "I care little", and the literal meaning is "I care about an ass", a construction equivalent to so many others that are reinforced by using sluts such as "I care about a fuck", "I care about a shit" or "I care about a cushion", where none of those words are synonymous with trivial or insignificant outside the context.
* Only one "like" per meaning and day, the more "likes" the meaning will appear higher in the list
