If this van is slopping, don’t come a-knocking

IF THIS VAN ISSLOPPING,DON’T COME AKNOCKING

After

If this van is rockin’, don’t come a-knockin’: a familiar saying or slogan; the exact source is unverified. A guess: no one line is the obvious source.

The picture

An orange van drips green slime onto a road at sunset.

The look

Roadside warning poster, orange and cream.

Seen

Not seen pasted up anywhere yet.

About

mishap city

Who put it up

Nobody has said. Slopaganda in the codex (a proposed entry).

An AI-generated poster, signed slopped.site at the foot like the rest.