A form of anime or manga, part of the hentai genre, where some kind of strange alien creature shoves its tentacles up a girl's vagina.
Save the schoolgirls! Use tentacle free products!
(An anti-tentacle hentai button I got at Nan Desu Kan '10)
by hai_bai November 07, 2010
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A type of adult anime or hentai which features characters (stereotypically and disturbingly young females) getting sexually violated by penis-shaped tentacles of a demon or mollusk or malfunctioning machine. Usually the tentacles produce an impossible amount of semen, and in some cases, the victim is fucked to death. How somebody can create or even get off on that shit is beyond all known logic.
Wapanese otaku are known to masturbate furiously to tentacle-rape hentai pics.
by otaku killer September 02, 2003
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Small, foreign limbs protruding from the ballsack area which tend to emit a colorless, putrid smelling discharge.
Noob: hey what are those????//


Alexzander von dick sack: those are just my ballsack tentacles. Notice the putrid discharge?
by oprah hitler March 09, 2009
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to act cool and as if sober when intoxicated.
Guy1: You man this is some good weed.

Guy2: Tentacles off man my mom is coming!

Mom: What are you guys doing?

Guy2: Nothing just doing homework.

Mom: Okay have fun.

Guy2: Tentacles back on!
by Carl Ondiac April 10, 2011
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Usually in adult-oriented Japanese Anime, when a large tentacled monster violates a woman in several orifices with his tentacles.

Also used synonymously with phrases like "took it up the ass"
Man, I got fucking tentacle raped at work.
by Omniverse March 27, 2003
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The act of sexually assaulting a woman with tentacles. Since no human being can really sprout tentacles, this is generally restricted to Japanese Hentai. A versatile entity, such as a robot or alien, can perform tentacle rape on multiple victims at the same time.
Guy: you're a freaky slut aren't you
Girl: yea baby, give it to me
<Guy sprouts tentacles and rapes her orfices>
by blarg July 07, 2004
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