Refers to a wealthy, stuck-up, or snooty person. It is used to describe someone who flaunts their high socioeconomic status and acts superior to others.
That guy doesn't like eating street food because he is very pipi and only goes to fancy restaurants in Escazu (a wealthy, upscale area of the capital).
A yellowish fluid (murky yellow for those with kidney problems) expelled either voluntarily (at the toilet or the roadside) or involuntarily (while sleeping), when the bladder cannot hold any more.
-Comadre (a term for a close female friend or the godmother of one's child), why is that mattress outside? -Oh girl: this little brat went pipi.