As of 2010/2011, this term is the subject of legal action (and considerable discussion) in Baltimore, Maryland, USA, where a cafe owner has trademarked the term. See e.g. The Baltimore Sun's article "Catonsville man challenges Hon trademark".
Definitions include: Brash Green Geese is a term used for a group of girls who are jealous that you're going out with a hot guy that they want to be with. They are loud, intimidating and jealous. Girl: "Babe, those girls keep giving me dirty looks when we're together."