I think it was a coded message to the water treatment Unions of America, whatever they're called.

Letting them know that included in dCity's third edition cards their will be a new card, the "Water Treatment Plant".

I know it's a combined card because of the not one, but TWO farts.
It's obviously Public Restroom related as he farted in public on TV.
And the black running down huis face is representative of the sewage the card will process.