2. used in several popblogs such as dafuq.biz and dafuq-posts.tumblr.com to indicate comedic or bizarre content.
3. An internet meme caption attached to images to indicate the image is comedic or bizarre to societal norms. Commonly seen on popblog icanhascheezburger.com.
Usually used in texts and comments on unusual or weird things.
"I don't know bro, I think it was a dog shaved and painted to look like a panda."