As with the concept of the NOWSPACE, Quantum Grammar was first introduced to the Plex Community through the content of Russell Jay Gould. It is difficult to fully understand what Quantum Grammar is, but according to the Post Master General (i.e. Gould) it is a weapon.
Russell-Jay: Gould. has been using these universally recognized flag laws, plus his secret weapon, a mathematical language (Quantum Grammar) to disqualify the constructs of hundreds of corrupt governments & global organizations to steer them away from using their powers unjustly against the people. - Gould's website
Further rules of Quantum Grammar can be found here.
While it's nearly impossible to understand the logic around Quantum Grammar, we can deduce a few things from this statement and other things he has said in his videos, such as: