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1.
Guro is essentially grotesque pornography, more common in hentai and Go Nagai anime. Extreme examples of Guro include diarrhoea scat, necrophilia, amputee sex, skull-fucking and violent rape.
Somebody posted guro... and I lost my boner.
by Jeff September 04, 2004
 
2.
Ero-Guro, most frequently shortened to just 'Guro' is short for 'Erotic Grotesque'. It is a sub-genre of hentai featuring blood, gore, disfiguration, torture, and bloody amputees. Many, if not most people to see it either see it funny, cool, or gross, although there are some that see it sexually attractive. Guro is just art, not real.
Guro is probably one of the least popular forms of hentai.
by in1t March 16, 2006
 
3.
A form of pron that makes baby jesus wanna cry. Usually involving anything from naked women with bloody cuts to naked women missing limbs. The general guro subcategories being blood/death and defecation. Check it out yourself to see one of the grossest things on the web...
Without thinking i opened a link to a goru pic, and fuckin puked.
by Kaiser-Sosse April 18, 2004
 
4.
A grotesque form of hentai featuring gore or scat.
guro-chan.net

I need not say more.
by Hebi August 27, 2007
 
5.
Something that only a sick fuck would see. Guro is basically anime hentai girls who are mutilated by giant mutants, robots, or insane men with giant knives. However, the ending product always seems to be sexy. However, some people have sense to do not want.
Bob: Man, did you see that guro? Her boobs were completely torn up but still, it was pretty awesome!

Tim: Dude, wait, WHAT?!

----

A perfect example of guro would be a naked anime hentai girl with giant boobies, and her feet are cut off, and her hands, and then her legs and arms. Her nipples are completely carved off, and blood is EVERYWHERE.
by ZackInTheCube September 27, 2009
 
6.
The hentai that truly sticks to your mind when you least expect it.

More wars have ended with presenting images of this kind to any army with most if not all commiting sucide in one go to just rid themselves of the images that twist and rip away at your very soul.
Hentai fan: Cat-girls are the best
Guro fan: If you enjoy that then you will enjoy this for certain
Hentai fan: The images have burnt themselve into my soul and mind and shall if ever never be forgotten.....I wish to be dead *Eyes glazed over*
Guro fan: And this is when she's......oh....oh that isn't really.....I wish to be dead *Dead*
Hentai fan: *Dead*
by Meta Tam When Hi Non June 09, 2009