My girl be getting sexual
After she raise the pressure
From the blood in my head
That be getting me all mystical

from Choo Jackson – This World Lyrics on Rap Genius

Meaning

His girl gets excited by the effect she has over him both mentally and physically. Lines 2 and 3 serve as a double entendre meaning she literally messes with his head but also causes the blood to rush to his metaphorical head below the belt.

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