But the doorknockers on the ear of a stewardess in a Lear
She's fine and she's flying, I feel I'm flying by em
Cause my mind's on cloud nine and in a mine at the same time
“Doorknockers on the ear” here means the hoop earrings of the flight attendant. “Lear” = jet. “Leer” = lewd stare. Basically, Lupe’s mind is in the clouds with the fine stewardess while also remaining grounded
“Door knockers” also suggests a stewardess knocking on the door of Lupe’s private cabin to furnish him sexual favors.
It’s hard to keep Islamic faith when you find yourself staring at this
And “a Lear” is a homonym of “Aaliyah”, a beautiful and talented young R&B songstress who died in a plane crash (RIP).
Lupe ends this sequence by introducing the thought that he is both in the air and underground at the same time, which he will continue in the next line. This union of opposites lets him “fly by” his opposition.
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