Khodahafez means good-bye/God be with you.
First, Obama had a brief phone conversation with the Iranian leader, the first between the two countries' leaders since 1979. Upon returning to Iran, Rouhani got in his Nissan Patrol(!) and was promptly greeted by supporters of reform (cheers) and haters of America (jeers). The haters even threw shoes and eggs at Rouhani's car. His bodyguards had to use umbrellas to deflect the eggs.
The other fun news to come out of this is that Rouhani (or his aide) actually tweeted the conversation with Obama. However, they were promptly deleted. But nothing ever gets truly deleted online, right?