Lyric discussion by artvandalay123 

Cover art for The Burden lyrics by Dropkick Murphys

It's reffering to James Lynch's first guitar which was a Frankenstein (hence, Frankie) that he still has and uses even though obviously it's totally beaten up, since he's had it forever, he always gets it fixed and stuff and won't throw it away. They're just talking about an old guitar that keeps on truckin.