It can mean biting, incisive, satirical, caustic. That speaks with irony. That it is pointed and that it punctures. That sucks, that harasses, that attacks.
It is said of what punctures, that gives stitches, that wounds like a pointed object. It can also be used figuratively for a high-pitched sound, or a situation that hurts feelings.
It is Pierce drawings with anything that is puntiagudoEspero that will help them...