Apparently, turning into a part of speech is a sign that you have arrived.
“She’s become an adjective. Friends will go shopping with each other and say, `It’s so Madonna.’ That’s what you want in fashion.”
—Stylist and tv personality Robert Verdi on Madonna, who turns 50 this weekend
But really, adjective, schmajective. I say becoming a verb is the height of fame (just ask Mr. Verb). When they start saying, “I madonnaed that outfit!” then we can talk.