"Chuva" is a Pinoy gay slang for boyfriend or lover, that became popular in the Philippines during the late 90s. It was even made mainstream by a movie of Jolina Magdangal and Marvin Agustin. It used to mean a lover or a fling, but later on evolve into word that can be used when you dont know what word to say.
For more Filipino slang words, visit Pinoy Slang