The process to apply a faux patch of hair on and around various body parts( such as the face, chest and genitalia) by pre-pubescent boys and girls in order to make themselves appear older than their actual age.
Little Bobby gotcaught by his older sister, astroturfing his chest hair before the party.
A thought-terminating insult used to dismiss legitimate opinions that happen to oppose anti-government or anti-corporate conspiracy theories.
Person 1: Did you see organization is doing policy?!
Person 2: There are some studies that show it's a good ide—
Person 1: REEEEEE YOU'RE ASTROTURFING REEEEEEEEEE!!1!!1!1!1!1!!!!