Hit eighteen no limit, you'll get it if you just listen

from Erick Sermon (Ft. Fred The Godson, Mone & Swizz Beatz) – Set It Off (2012 version) Lyrics on Rap Genius

Meaning

This refers to Blackjack.
Fred will hit on an 18, which is generally a very risky endeavor, because he doesn’t care about the money, and he’s generally irrational.

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