What does cumplir mean?
Expression
to have done your duty — turned up, stayed long enough
Cumplir with no object means having made the gesture expected of you: turning up, staying long enough, bringing something. It says nothing about having enjoyed it, and usually implies the opposite. There is also quedar bien, which is the same thing seen from the outside.
Vamos un rato, saludamos y ya hemos cumplido.
