You fly, but I ain't going down on no landing strip

Meaning

Royce prefers the Brazilian wax to the bikini wax.

As Eminem would say:

Look at her bush; does it got hair?

(Royce would rather play ball in a grassless field..)

Play on words. Planes fly and land (go down) on landing strips.

Adding to the previous line, Spanish Fly is also an aphrodisiac (something taken to enhance sex)

Landing Strip is a way to cut pubic hair. You remove all except for a thin line, hense the ‘landing strip’.

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