1. An armlike appendage found on octopi, squid, and space aliens. They are often covered in suckers.

2. Sensory appendages on snails, slugs, and space aliens.

3. A basic part of twisted Japanese hentai porn, where octopuses and other creatures rape schoolgirls with their tentacles.
1. A male octopus actually has 9 tentacles if you count the one used for reproduction.

2. The top pair of tentacles on a slug enables it to see. The lower, shorter pair is for taste and smell.

3. Police in Tokyo have to respond to yet another tentacle rape.
by Purple Gurl October 1, 2014
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A strange fetish belonging to my gf.
Don't ask how it's even possible.
"OMG, did you read that fic where Gee has TENTACLES? It was soooo hawt!!!!1!!!11"
by mexheartxyou May 22, 2008
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A collective of long, slimy tendrils that often appear in hentai, which violate innocent lolis sexually.
Hey man, did you see those tentacles fuck Suzie?
by Caleb Caston May 5, 2018
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The spectacularly-failed attempt of Gary Schofield and Jason Loia on making a cash grab from a badly-done concoction of Tumblr, IMVU, and 4chan, which they funded through milking Gaia Online as hard as they could. It seemed like it was created basing on a 13-year-old's expectations of an 18+ site.

Its name alone guaranteed that the site would be used almost exclusively for cybersex and sharing porn. After most of its users realized that there's nothing else to do, they ditched it and moved elsewhere. It was eventually shut down on December 1, 2014 due to lack of users.
Tentacl might have been successful ten years ago but it looks really dated & the 18+ execution is full-on trash. It's visually awful and the UI is terrible. Couldn't they find a decent web designer in Silicon Valley?

User1: Tentacl belongs in the trash.
User2: No, not even a trashcan should be subjected to that.
by DopamineBaby December 15, 2014
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The shit that goes in anime pussies. (Hentai)
Today I watch a porn video that had a tentacle instead of a dick.
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a huge long red slimy organic living thing that likes to rapes
<Leechasd|Saber> holld shit
<Leechasd|Saber> look at those tentacles
<Leechasd|Saber> so pure
<Leechasd|Saber> so red
<Leechasd|Saber> so big
by sekai June 13, 2004
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