"Okama" (or "o-kama") is Japanese slang for "gay man", particularly in reference to very effeminate gays. The word can also mean "drag
queen."
It comes from the
Edo-period slang for "anus" (using the word "kettle" for the
butt seems to be an idea borrowed from the Portuguese.)
It is not always considered insulting, and drag performers will sometimes even use it in reference to themselves.
"Okage", the burnt rice that sometimes sticks to the bottom of a cooking
pot, is sometimes used to refer to women like to hang out with
gay or effeminate men.