Wrestle with the man of mankind.. put a sock in it
Smell what I'm cookin'
Got em shocked with it
Make their eyebrows raise when they rock with it

from Cash Sinatra, w/ Mel, F.L.O.W. & Fame – Oldie Freestyle Lyrics on Rap Genius

Meaning

All wrestling fans know ‘mankind’ used to put a sock in his opponents mouths as his finisher
Keeping up with the wrestling references
‘The Rock'use to say “smell what im cooking"
and He had a famous eyebrow raise

While sayin people will be surpised and raise their eyebrows while “rockin” with Flow

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