astroturfingas‧tro‧turf‧ing /ˈæstrəʊˌtɜːfɪŋ $ -troʊˌtɜːr-/ noun [uncountable]the practice of making people believe that a lot of ordinary members of the public like a product or support something and are not being paid to say this, when really it is part of an advertising or political campaign—astroturfer noun [countable]