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Wyrd
Wyrd is a representation of a Character's path, their destiny, it is a measure of how much control an individual has over their fate.
A Character with high Wyrd seems to take horrific injury after horrific injury and yet receive nothing more than a scratch, looking one second as if they had lost an arm and with a blink the lost arm is just a nick on their forearm.
Mechanically Wyrd is how a character can avoid injuries and other bad results through the "Not Today!" Action, Wyrd is a special resource in that it does not regenerate in anyway other than increasing the Stat itself, once you are out of Wyrd points, they're gone forever!
Wuntch's Whatever
Wyrd is MEANT to be spent, while yes this is an RPG and your character is yours to play, i would strongly recommend not hoarding their Wyrd like consumables in every elder scrolls play through ever 
, part of the fun and thrill i find in Meat Space, is the threat that your character may meet their untimely end or perhaps lose a limb during any encounter, and thats OK. Go forth and spend that Wyrd when you need to, get to that last session and have one single point left coming in at a critical moment when death is on the line and BAM! Chargog the Zerk miraculously dodges the disintegration beam that wouldve turned him to so much dust! All this to say there can be a lot of fun in spending your resources.