Flow tsunami, ring the alarm

from Big Boi (Ft. Kelly Rowland) – Mama Told Me Lyrics 13 on Rap Genius

First, “flow tsunami” is relating Big Boi’s flow to tsunamis, which are the greatest of waves.
Also, when tsunamis are found coming towards land, there will be an alarm for evacuation.
This line is also related to the previous two which are about earthquakes and storms, as all three are natural disasters.

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