This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of or pertaining to masturbation (onanism)

adj. In a manner which suggests masturbation; hence, fruitless, self-congratulatory, self-absorbed, pointless

Of, pertaining to, or caused by onanism.

"The whole thing is essentially a carnival redux ofLady in the Water, in that Lady in the Water was a pointless, onanistic allegory about how misunderstood – nay, how veritably Christ-like – M. Night Shyamalan is for making movies as brilliant as Signs and, uh, The Village."

onanistically