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1.
the act of creating a small organization and making it appear to represent something popular for the purpose of promoting a particular entity, cause, etc. (a play on grassroots in the sense of a popular movement originating among the common people, ultimately from AstroTurf, a brand of artificial grass)
The practice of astroturfing a widely used form of propaganda, as evidenced by the media coverage it receives.
by The Return of Light Joker October 04, 2008
 
2.
"Astroturfing" is the act of trying to boost one's image online with fake comments, paid-for reviews, made-up claims and testimonials.
The GOP, Palin, and Cheney, are getting pretty good at astroturfing.
by Guido1 March 26, 2010
 
3.
a form of propaganda whose techniques usually consist of a few people attempting to give the impression that mass numbers of enthusiasts advocate some specific cause. This is often done by conjuring up a phony organization(s) that never existed.

"David Axelrod, the TOTUS's Minister of Propaganda and the man behind the teleprompter, is the king of astroturfing."
by Higg - penna. April 23, 2009
 
4.
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 got caught by his older sister, astroturfing his chest hair before the party.
by panoptican April 16, 2009