Adjective used to describe a genuinely gorgeous female. Often the girl may possess traits that remind someone of balmy island weather; she's relaxed and laid back but still friendly and willing to smile. Isn't the type to cake her face with makeup or yak away on her cell phone.
"Yo Edson, check out that group of balmy girls over at the bar."
"Oh Jesus, I've got a boner the size of a palm tree."