An affeminate or gay man.
Mexican slang, literally "little butterfly". If you don't believe this definition go to south central LA and shout it at every hombre you see.
Eres mi mariposita (You are my little faggot)
Mexican slang for a very effeminate homosexual. Mariposita is a less offensive term for a Maricon. Usually anything ending in -sita implies one who is afeminado!
There is that Mariposita who is just so sweet!