Scribbling on the sidewalk should be considered graffiti.

A few afternoons ago, I was walking back from school and along the way, I caught sight of this all over the sidewalk:

Most likely done by my neighbor's idiot children who are partying loudly AS I WRITE THIS.

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I estimate that it covers the area boxed in red in the below image:

(The blue line is the path I walk along to and from my bus
stop.)

And to prove my point, read this: "Graffiti (singular: graffito; the plural is used as a mass noun) is the name for images or lettering scratched, scrawled, painted or marked in any manner on property." From: http://en.wikipedia.org/wiki/Graffiti