To play dumb, to pretend not to notice, or to look the other way to avoid a problem or responsibility.
Hazte la wili, it does not matter, just do not say later that I did not try to talk. / Stop trying to hazte la wili with that work because you have to finish it.
To duck out of a responsibility without others knowing. It is mostly used to refer to playing hooky or skipping classes (in Argentina, this is the standard term for school truancy).
The kids se hicieron la rabona and they think we did not notice.
To rush through or skip official procedures or requirements, often to get something approved quickly by cutting corners. (In Peru, it is commonly used in political contexts to describe railroading a law or contract through the system).
They festinado the usual process just to get that law passed.
The act of a group collectively shunning or ditching a person, usually someone considered a lambón (a freeloader or sycophant). The group often uses la nebula (acting vague or creating a distraction to escape the person).
Ex 1: That guy got bola negra for being a freeloader. Ex 2: Let's give that dude bola negra, he is just a puppet.