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1.
Culture jamming, is the act of using existing media such as billboards, bus-ads, posters, and other ads to comment on those very media themselves or on society in general, using the original medium's communication method. It is based on the idea that advertising is little more than propaganda for established interests, and that there is little escape from this propaganda in industrialized nations. Culture jamming differs from artistic appropriation (which is done for art's sake), and from vandalism where destruction or defacement is the primary goal.

The word, "culture jamming" comes from the idea of radio jamming: that public frequencies can be pirated and subverted for independent communication, or to disrupt dominant frequencies. The Situationist International first made the comparison to radio jamming in 1968, when it proposed the use of guerrilla communication within mass media to sow confusion within the dominant culture. (Kalle Lasn, the founder of AdBusters magazine, wrote a book entitled Culture Jam, but the term predates his title.)

Culture jamming is a form of activism and a resistance movement to the hegemony of popular culture, based on the ideas of "guerrilla communication" and the "detournement" of popular icons and ideas. It has roots in the German concept of spass guerilla, and the Situationist International. Forms of culture jamming include adbusting, performance art, graffiti art and hacktivism (notably cybersquatting
lets go out and culture jam that fucking Halliburton billboard
by Logan Marshall November 29, 2004
 
2.
(Noun) The use of visual, spoken or performance art to decry or draw attention to preconceptions, societal mores, governmental abuses or corporate waste, fraud and greed. Also related to culturejamming (V.)
Adbusters.org contains several excellent examples of culturejam.
by Rowan Ste. Julian August 25, 2003