noun. A childish insult or anatomical curiosity.
Real citation: "hey sombrero, how are you doing? I'm gonna try to make this a good comment ok? hmmm.....yea so thats about all I can think of to say :( man I'm pathetic but at least you love me!!!! ok well umm poopfacebutt, pwned"
(Brian, April 2, 2006, http://profile.myspace.com/index.cfm?fuseaction=user.viewprofile&friendid=4231810)
Made-up citation: "I'm proud to be a poopfacebutt, yet ashamed to be an asswipehead. Identity is complex and problematic."