Double entendre;
As well as the literal meaning, he’s going to take you on a high while you listen to him spit.
Dr Dre considered himself to be the Captain of N.W.A who were pioneers of Gangsta Rap

I agree with;
Kanye = Legendary producer turned legendary rapper
Dr. Dre = Legendary producer turned legendary rapper
2Chainz however is not the next Snoop Dogg…
Also refers to a ten year olds dick getting bigger through puberty.
Royce went with Eminem when he toured the United Kingdom and Australia. Also more recently, Japan.
Also may refer to his raps in Murder for Excellence, “41 souls murdered in fifty hours”
‘Strap finger’, referencing his index finger on a gun. Should be highlighted with the rest of the metaphor.
Chris Reeves graduated, I’m a super SENIOR*
If you think about it, Eminem is also a stay at home dad.
His ‘perfect bitch’ is a whore. He knows this but because he’s in love with her he can’t see past her flaws.