The Lame Duck probably expected his path to be strewn with rose petals and be welcomed as a liberator on his final visit to Iraq, but it didn't quite turn out that way. WashPost:
But during a press conference with Iraqi Prime Minister Nouri al-Maliki, Bush received a taste of the immense resentment many Iraqis feel toward his policies: Just after Bush finished his remarks and said "Thank you" in Arabic, an Iraqi journalist took off his shoes and hurled them both at Bush, one after the other. The incident lent an air of chaos and farce to a trip intended to highlight improving security conditions in the war-torn country.
"This is a farewell kiss!" the man, identified as Muntadar al-Zaidi, a reporter with the Cairo-based network Al Baghdadia Television, yelled as he threw the shoes. Bush had to duck out of the way, and narrowly missed being hit, according to on-scene reports. Maliki reached out his hand to shield the president.
Zaidi started to yell "Dog, dog!" as he was surrounded by security agents, who tackled him to the floor and began to beat him. Zaidi was later removed from the ornate room where the press conference was taking place.
Throwing a shoe at someone is considered the worst possible insult in Iraq, and is meant to show extreme disrespect and hatred towards someone.
And after all he did for the Iraqi people. Ingrate!