Chest-high and rising, almost touching the knees
Of stewardess and the pilot,

from Lupe Fiasco (Ft. Gemini) – Dumb it Down Lyrics on Rap Genius

Meaning

Lupe’s metaphor sinks lower and lower. The plane has landed in water, and is at the chest level of seated passengers and the knee level of the crew, presumably standing up to coordinate in the emergency.

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Chest-high and rising, almost touching the knees Of stewardess and the pilot,

Chest-high and rising, almost touching the knees
Of stewardess and the pilot,