I'm thirsty for this green so bad I'm dehydrating
He’s making a play on the word “thirst”. He’s saying he has gone so long without seeing any money, that it is leaving him physically drained or thirsty.
Also implies he is dehydrating because he’s sweating so hard to get it.
To help improve the meaning of these lyrics, visit "Murder Murder" by Eminem Lyrics and leave a comment on the lyrics box