Lyric discussion by mostlyharmlessmike 

Cover art for I Wrote It lyrics by Mighty Mighty Bosstones, The

I always felt that this song was meant to express something you jot down or come up with when you are in a condition that is abnormal (i.e. drunk). You think that it is genius at the time, but when you come back to it the next day or at some point later, you realize that your epiphany was complete gibberish or not as profound as you originally thought it was. The song it's self has this sort of rambling way about it, trying to say something but never really getting around to it. And in the end even it even goes to say "it's not important what I wrote". Perhaps Dicky is trying to express more the joy of writing down something you deem important at the time, over what it is you actually wrote. If that makes any sense.

The Bosstones never fail to come up with songs that you can sink your mental teeth into.

I got the idea that what he wrote isn't important, just the fact that he wrote it. Like sometimes the creative act is more important than the creation.

But maybe you're onto it with the drunken epiphany thing. Maybe making the attempt to follow through on the inspiration is what's important.