The term often refers to truth relativism, which is the doctrine that there are no absolute truths, i.e., that truth is always relative to some particular frame of reference, such as a language or a culture.
A dog! Buddha nature!
All manifest, actual and alive.
But with the slightest touch of yes and no
Dead your body, lost your soul.
In response to the monk's question, "Does a dog have buddha nature or not?" Joshu's answer, just Mu, is "all manifest, actual and alive." He has presented his mind totally, put out all the cash with no part payments. Here Joshu wields his gleaming sword. Here, if you start making intellectual discriminations like "this and that" even a little, it will slash you in two. It is like being deathly ill. If you start saying "Yes" or "No" even just a little, or start wandering around thinking in dualistic terms, at once you lose your life.
The Book Of Mu: page 42