Third Eye Blind - Semi-Charmed Life Lyrics Meaning

Okay, First I'll explain the drug references. "The sky it was gold, it was rose I was taking sips of it through my nose"
Crystal meth is rose coloured, and you snort it. When you bump, you take small amounts of the drug to keep up your high. So that's the whole, "And a bump for the drop
And then I bumped up I took the hit that I was given Then I bumped again And then I bumped again"
"When the plane came in she said she was crashing..." crashing is coming down from a high.

Now I'll explain it as best I can verse by verse.
The chorus is saying that the semi charmed life is the bittersweetness of being a drug addict. So his girl is saying that she wants something more in their relationship than just having sex and getting high together (I want something else to get me through this semi-charmed kind of life), but he's too high to change for her so she'll stay (I'm not listening when you say goodbye).

The whole second verse before "how do I get back there to the place where I fell asleep inside you" is about getting high.
Then he's saying that he wants to go back to the time when they first started getting high together.

In the third verse, the girl is crashing from her high, so she sleeps with him in exchange for drugs.

This song is a very sad song.