Lyric discussion by Acoustic-Bandit 

Cover art for Don't Worry Desmond Dekker lyrics by Mighty Mighty Bosstones, The

The song is a tribute to Desmond Dekker (Who died not too long ago if my memory serves me correctly), and to the state of Ska/Punk/Reggae in general. It also serves as a personal recollection of the ToneS themselves, and what they've been through.

He's acknowledging the roots of their music, while still assuring that ska-punk is doing just fine and will continue too (Represented by the line: "and don't worry, Desmond Dekker's doing fine). It's a great song, one of their best in my opinion.