what's the meaning of grassy knoll...I understand it is a hill with grass, but is there any other meaning to it ?
The grassy knoll was an area along the parade route in Dallas during the assassination of President John F. Kennedy.
Many conspiracy theorists believe it was here that the actual fatal shots were fired by trained assassins. There are even pictures in circulation of E. Howard Hunt, CIA spook and general-purpose Illuminati handyman, standing on the knoll alongside several other men who appear to be pointing rifles.
Check out Oliver Stone's "JFK" if it is available to you on video.
In recent years, "grassy knoll" has become a general term within conspiracy vernacular.