I have seen this (not the rebus, but what it represents) written on many places. Could you guess what it is and on where I may have seen it?
S(t)ick no bills
as illustrated for instance at https://www.flickr.com/photos/codein/90245453
Sick with Tea = Sick with T = STICK
Forbidden sign = NO
Bill Pullman, Bill Murray, Bill Hader, Bill Maher, Bill Walton = BILLS
It could be
"ill" not "bills" - subtract the first from the second and you get BS.
The only thing that comes to mind is
post no bills
I just can't find the connection for the first word.
I could think of:
"Sick leaves are not paid"
the explanation is:
"If sick, No Bills"
It could be:
Post - The image shows a sick spot and "post" is an anagram of "spot"
Bills - the pictures are of people called Bill.
It would have been seen:
On the walls of many buildings or on hoardings where the owners don't want flyposters to stick up advertising material.