guerrilla marketingguerˈrilla ˌmarketing noun [uncountable] 
marketing (=the activity of deciding how to advertise a product, what price to charge for it etc) that uses new, clever, and unusual methods to sell a product, rather than spending a lot of money to sell it
marketing (=the activity of deciding how to advertise a product, what price to charge for it etc) that uses new, clever, and unusual methods to sell a product, rather than spending a lot of money to sell it