They can't wait to catch me in Dallas
Top down on the grassy knoll and clap me

from Jay Electronica – My World (Nas Salute) Lyrics on Rap Genius

Meaning

JFK thought that nothing would happen that day and therefore everyone around him had their guards down basically (he was driven around in a top-down convertible of all cars). So, people can’t wait till Jay lets his guard down so that they can come in and do away with him.

He’s also referring to him and his girlfriend Erica Badu, who is from Dallas, Texas.

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