OK, so what does this SCMEEN anyway? With only 12 thumbs up, Urban Dictionary indicates the meaning has something to do with a good looking “white girl”, but if you question anything on Urban Dictionary, question those entries with under a hundred thumbs up. It could just be a last name, but it doesn’t seem very common. There’s a lot of “Green Schmeen” search results on Google including this awesome t-shirt design, but I don’t think this Honda CRV vanity plate has anything to do with any of that unless the owner has simply named their vehicle “SCHMEEN” (perhaps because of the whole “green schmeen” thing).
Although it is possible that it’s the Urban Dictionary meaning, I’ll file this one under unknown for now.