We're just not sure what.
It's confusing because news outlets differ in their reporting.
Sheena McKenzie and Kevin Liptak (CNN) report:
Philippines
President Rodrigo Duterte tore into President Obama with an obscenity
on Monday, leading the White House to cancel an upcoming meeting with
Duterte.
White House officials previously said Obama would confront Duterte about his country's handling of drug dealers, including extrajudicial killings, which are government executions without the benefit of judicial proceedings.
"Who
does he think he is? I am no American puppet. I am the president of a
sovereign country and I am not answerable to anyone except the Filipino
people," Duterte scoffed in a speech Monday. "Son of a bitch, I will
swear at you."
BBC quotes Duterte this way:
US President Barack Obama has
cancelled a meeting with controversial Philippine President Rodrigo
Duterte, who had earlier called him a "son of a whore".
Mr Obama had said he would raise the issue of drug-related extrajudicial killings in the Philippines.But Mr Duterte, who has sanctioned the killing of drug dealers, said if that happened: "Putang ina (son of a whore) I will swear at you in that forum."
So what did he call her?