This porn video tag, "twinkbig9," refers to a specific type of content. "Twink" is slang for young, slim, and attractive males who are usually under 21 years old. "Big" could indicate a focus on larger than average body parts or size in general. The number "9" might be related to a particular scene or series within the porn genre.
In summary, this tag describes a video featuring young, slim, and attractive males with emphasis on larger-than-average body parts or size, which could be a part of a specific scene or series titled "twinkbig9."