Its about their former bass player Justin sane (justin meacham I think) suffered from depression, and wrote this suicide note. He tried killing himself with cough syrup, and failed to do so. Part 2 is about why he shouldnt have done it. And what it would of been like without it.
He spent about 3 months in a mental institution. "when he got out is was like he was always on acid"-m shadows. It was to the point where the band just couldn't take it anymore. So Justin had to go.