WASHINGTON—In an unexpected turn of events that even his most ardent supporters are calling extremely ill-advised, President Obama, known for his simple yet stirring slogan "Yes we can," debuted a new, extremely annoying catchphrase Monday during an address on proposed economic policy reform, saying, "It is time for America to move forward, not backward—and in conclusion, hot diggity ding dang!" The new catchphrase, White House officials announced, will replace the former slogan as the focal point of the president's public image effective immediately, and will be implemented in all appearances, official correspondence, and executive paperwork from now until at least mid-2012. Publicity materials featuring the wince-inducing phrase—and picturing Obama smiling wildly and giving a double thumbs-up to the camera—were distributed this week to thousands of media outlets. "We have no idea why he's chosen to do this," said former Obama supporter Kyle Hammersley. "It's unbelievably irritating." "Hot diggitty ding dang" was reportedly selected by Obama and his advisers from a final list of potential taglines that also included "Hanker down—soup's on!" "That's what the doctor told me!" and "Mama mia, where's-a mah pizza?!"