Advertisements about Advertisements
The most common definition of meta-advertising is an ad about an ad. This form of advertising is popular with Super Bowl advertising. Super Bowl ads and spots cost far more than regular ads. The Super Bowl ads are highly anticipated. This often leads the companies to air ads encouraging viewers to watch the companies' upcoming Super Bowl ads, a form of meta-advertising.
Other examples include advertisements in one form of media, advertising for an ad in another medium. This could include a radio ad saying "Look in your Sunday paper for a free coupon."
Advertising for Advertising Agencies
The term meta-advertising can also refer to advertisers advertising for themselves. This could include an advertisement for an ad agency.
Meta-advertising can also include ads which advertise for advertising. This is common with billboards, such as a billboard that says "A thousand people will pass by this billboard today. To advertise here call..."