Careful what you say, there ain’t no punks over here so follow me
Through the fog like I’m S-N-double-O-P
Let me guide you through the smoke G

from Eminem – You're Never Over Lyrics on Rap Genius

Meaning

Snoop Dogg is, of course, a major collaborator of Eminem mentor Dr.Dre

“The fog” is a reference to Snoop Dogg’s Who Am I? (“Then I step through the fog and I creep through the smog”), Em uses ‘G", the stereotypical Snoop greeting

Snoop also has a similar line in “Stranded on Death Row”.
Also a reference to Snoop being the “face of smoking weed” so to speak.

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