That theory is so very unlikely..
and I wouldn't call Berzerk a positive song either.. he insults/makes fun of at least 3 or 4 people...
So baby make just like K-Fed and let yourself go, let yourself go
After Kevin Federline had children he “let himself go” (i.e. got fat). Eminem wants all the ladies in the club to let themselves go when they hear this song, as in get loose, have fun, and lose yourself in the music.

All I know is I fell asleep and woke up in that Monte Carlo
With the ugly Kardashian
While his competitor Kanye West is with Kim Kardashian, Shady is content with just taking the “ugly duckling” of the family, Khloe. But that’s fine with him.

Lamar, oh sorry yo, we done both set the bar low
Lamar Odom married the “ugly Kardashian” Khloe (he even got her initials tatted on his hand!). Em says that both he and Lamar have low standards for getting with her. “Lamar, oh” also sounds like Lamar O[dom]. (Also could be a reference to Kendricks Control verse "What is competition? I'm tryna raise the bar high")
Far as hard drugs are though, that's the past
But I done did enough codeine to knock Future into tomorrow
He teases new-school rapper Future, because he always “raps” about how he drinks codeine . Also, a play on words with Future’s name. The future is tomorrow (and also contrasts the past in the previous line). So he’s going to knock Future into tomorrow. He may have tried to avoid the harder stuff in his past, but he went through recreational drugs like lean like they were nothing.
Sounds like Classic MMLP Shady to me.
