Guerrilla marketing is an unconventional system of promotions that relies on time, energy and imagination rather than a big marketing budget. Typically, guerrilla marketing tactics are unexpected and unconventional; consumers are targeted in unexpected places, which can make the idea that's being marketed memorable, generate buzz, and even spread virally. The term was coined and defined by Jay Conrad Levinson in his 1984 book Guerrilla Marketing. The term has since entered the popular vocabulary and marketing textbooks.
source: http://weloveviral.blogspot.com/2009/03/guerrilla-marketing-and-ambient-media.html
