I've found these dose sings primarily in downtown fort lauderdale, but have seen them about 20 miles apart (two greatest distances.. the beach and davie)

When I think of the word dose, I suspect acid, too... though lately, I would prefer Ynot doze... a little nap is always welcome!

I'm not sure what the meaning is. There are a few guerilla artists in town, some do sculpture, some graffiti. it may not mean anything!