Probably many of us have seen some of our phrases used by others both inside this forum and outside, and without attribution. Certainly many of us have heard our words in use by others in the workplace, and without attribution. It might be tough to enforce copyright for a neolexage or a phrase, and it might be that the rules of language are such that we should have no exclusive rights to our individual creations unless the creations are an entirety, that is, a complete essay, book, or other such complete unique composition.
Leave it to a linguist to discover who coined a phrase.
The only way to demand and take credit for the origination of something that "everybody" is repeating is to say it often enough (and sometimes prefaced by "Like I always say..."
I've tried to get others to pick up my word of Zogbyism to little result.
The more condensed the meme, the more volatile the spore.