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1.
To have tentacles of some kind - be it from machines, aliens or plants - stuck in every orifice of your body and rubbing various other erogene spots. Since erotic material such as this is extremely hard to recreate with real actors, it is almost solely used in japanese hentai. See tentacle monster, tentacle rape.
(While watching a hentai movie)

Wow, look! She got tentacled!
by KiddDaBeauty September 23, 2005