The two Bronx women, Priscilla Pena and Michelle Blassingale, were caught wearing black apparatuses with silver plastic wrappers "rigged like a girdle around their hindquarters", CBS News reports.
Officials found the 6.5 kilos of cocaine shared between the two diapers.
Pena and Blassingale had landed in New York City from the Dominican Republic when a sniffer dog alerted officials to Pena's midsection.
They were both arrested and charged with smuggling, according to the New York Post.
Blassingale was held in custody in Brooklyn and Pena was released on a $150,000 (£94,600) bond.