![1girl censored cum doujinshi fellatio greyscale heterochromia highres huge_penis monochrome oral penis rozen_maiden sorimura_youji suiseiseki testicles tongue rating:e score:1 post #147014](/cdn_image/preview/95/1e/951ef023755a068f8aebef567425e08c.jpg)
A penis that is extremely large compared to the character’s overall proportions. Generally, any penis longer and/or wider than the character's lower arm falls under this category.
A monster with a huge penis could fall in the category of tentacles.
This tag implicates penis (learn more).