It doesn't mean anything. Is nothing more than an onomatopoeic expression that became fashionable in Spain in social networks, mainly among the users of Twitter.Se used to imitate the sound of a blow or quot; zas quot; as well as a verbal slap. It is also used to refer to the reply that a person gives to ridicule, embarrass or let out to another.
* Only one "like" per meaning and day, the more "likes" the meaning will appear higher in the list
