The place on youtube, whereby some sorcery, your continuous clicking of recommended videos has now got you to a video of horses doing it, medical breast exams, or how to do an exotic massage. Pretty much the place containing the most suggestive videos on youtube which are painfully difficult to fap to. The top comments usually are something along the lines of 'How did I get here?', or 'Weird part of youtube, we meet again.'

when you're hungover as shit after a spending a night drunk as a skunk

Every part of youtube

That part of youtube where one finds videos such as just plain retarted conspiracy theories, end of the world preditctions, and pictures of satans face in clouds or fire.

the part of youtube where one encounters very odd videos, such as the retarded running horse, retarded dog, and drunk squirrel.

It is like the Deep Web or Dark Web of YouTube. Normally reached by consistently clicking on "Suggestions" or "Recommended Videos."