Catch me in my Mercedes, bumpin' Ice Ice Baby
Screamin' Shady 'til I die, like a half a pair of dice, life's crazy

from Bad Meets Evil – Fast Lane Lyrics on Rap Genius

Eminem is riding his Mercedes listening to Vanilla Ice’s (white-rap classic) “Ice Ice Baby”. Around 2000, Eminem had a beef with Vanilla Ice, why is he bringing that up though? Not to be taken seriously like Royce’s unicorn line.

Screamin Shady ‘till I DIE, like a half a pair of DICE

This MIGHT be a triple-entendre:

• One dice : a Die, pair of dice : two Dice

• Em has ‘a (retirement) paradise’ (following off of Royce’s opener of living on an island) waiting for him when he dies (when he’s done as a rapper).
  Eminem often refers to his rap career as half-great half-awful.

• Sets up for the literal use of dice in the following lines with ‘Don’t stop me I’m on a roll’ (as in rolling in his Mercedes, dice rolling, and himself “ON” a roll in his flow)

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