stenoglyphics 

a term used for bad, almost unreadable handwriting.

(steno- referring to stenography or shorthand, a way of writing and
-glyphics referring to hieroglyphics)

"Man, this handwriting is hard to read."
"Ask Jane, she can decipher stenoglyphics."

stenoglyphics by @kenopsianxiety November 8, 2018

styroglyphics 

The act or result of carving doodles into a styrofoam container with your fingernail.

I found some styroglyphics of indeterminate anthropological value while cleaning the fastfood containers out of my car.

styroglyphics by MTQ August 5, 2007