But warning - fall faster
Than asses with age slack on the back of a Kardashian

from Jean Grae (Ft. Pharoahe Monch & Royce Da 5'9") – Assassins Lyrics on Rap Genius

Meaning

The Kardashian sisters, especially Kim, are noted for their large asses. When humans get older, body parts being to fall, sag, become slack, etc.

Since Kim is carrying around a lot of weight back there, her butt is going drop fast, like the bodies of Jean’s enemies

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