I'm a veteran, flowing way colder than the seven seas

from Capital STEEZ (Ft. Madlib) – Capital STEEZ Lyrics on Rap Genius

The Seven Seas most likely refers to the original Seven Seas laid out by the Phoenicians. These include:

Alboran Sea
Balearic Sea
Ligurian Sea
Tyrrhenian Sea
Ionian Sea
Adriatic Sea
Aegean Sea

Like these seas flow their cold water into the Atlantic, STEEZ planned (RIP) to use his cold flow to make his way into the mainstream.

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