So Cosmo says you're fat
Well I ain't down with that!

from Sir Mix-a-Lot – Baby Got Back Lyrics on Rap Genius

Meaning

The girls in cosmo are skinny bitches, so they make thick girls look like hippos

The magazine Cosmopolitan features pictures of thinner than average women and by Mix’s opinion, implies that curvy women are fat, which is incorrect, and Mix needs it to be known.

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