noun
jack-off material; something to masturbate to
Vulgar slang; refers to pornography, erotic images, or any content used for masturbation. From オナニー (masturbation) + ネタ (material).
See also: おかず
昨日、いいオナネタを見つけた。
I found some good jack-off material yesterday.
彼は毎晩オナネタを探している。
He looks for something to masturbate to every night.