has four meanings in the OED.

The first is to exude something from a wound.

Second: to write, and says the proximate source is unknown, but refers to Latin scribere, to write.

Third: to draw pictues on pavement or sidewalk with colored chalk, to be such an artist

Fourth: of horses, to have legs split apart while running on ice.

I suspect someone tried to noun a verb on you.

Either or else it's a term of art that the writer understood and used to the exclusion of most others. A prescriptivist might wonder why someone would try to communicate with a word that no one else understood, but then thinks of the antics of William F. Buckley, Jr., who had no problem showing off his command of exceedingly obscure words for no reason other than to be a showoff. Nah, never mind.

TEd