Okama

Okama is Japanese slang for homosexual or transvestite. Literally meaning "a pot, a kettle" this word, always with the honorific prefix "O-" refers to a gay man, especially one who is viewed as effeminate or a drag queen. Can be pejorative. The word originated in Edo period slang for the anus. In current use.

In One Piece, Baroque Works member, Mr. 2 Bon Kurei is an okama, and uses a martial arts fighting style known as "Okama Kenpo" in the Japanese Manga.

Also, in the anime filler arc, Warship Island, Erik the Whirlwin was accused of bing an okama by Luffy several times because of his Devil Fruit, the Kama Kama no Mi.