Definition: The posting of a message on a public internet wall, such as facebook.
Function: noun, developing usage as a verb as well.
Usage: often attributive.
Etymology: New English, wallee.
noun form: "I read the wallee your old roommate posted today, yeesh!"
verb form: "Check it out, I walleed you."
plural: wallees. As in: "Wow, Adam Sandler posted two wallees on my facebook today. I will never erase them."