According to http://www.murketing.com/journal/?page_id=2 this mixture of murky and marketing originated in 'The Murketing of Red Bull': 'Murketing, as you might guess, derives from murky. Usually the wizards of branding want to be extremely clear about what their product is for and who's supposed to buy it. Red Bull does just the opposite. Everything about the company and its sole product is intentionally vague, even evasive. While the drink appears to be targeted specifically at someone — extreme athletes, ravers, cosmopolitan students — the brand identity is actually pretty nebulous. You could argue that what Red Bull drinkers have in common is a taste for the edgy and faintly dangerous. But what does this really mean? Obviously any attempt to articulate such a thing would immediately destroy it. The great thing about a murky brand is that you can let your customers fill in all the blanks.'