1º_ It is a term related to the blackboard in its various meanings. How to work that mineral to obtain it or shape it. Or do design on advertising boards. Or in sports referred to the scorer (which was formerly a blackboard), as a ruse to alter the points, or making a more lucid game, more carefree because the many are very much in favor of the player. 2º_ It can also be an inflection of the verb slate for the action of any of the previous definitions. See verbs/blackboard.
Inflection of slate, which means to alter, falsify, adulterate. Cheat. Action and effect of whiteboarding. Adulteration, counterfeiting, cheating. It can also be writing on a whiteboard or board (where it can be easily erased).
PIZARREO mountainous term used in Cantabria to refer to relationships between couples, as I understand it.