Playing with Barbies,
Kendrick, like in the previous line, is referring to white girls who stereotypically played with Barbies as a child but turned into party animals like Lindsay Lohan because of molly.
He’s also referring to the rappers who just hit the club and look for a “Barbie” type girl (blond hair, big tits) instead of putting the work in.
“Barbies” can also refer to barbiturates (downers), another pill the targets of this line might be popping.
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