U.S. President Barack Obama pounced on Mitt Romney’s changing views during a campaign stop Friday in Virginia, coining the term “Romnesia” to describe the Republican presidential candidate’s views.

The Twitter hashtag #Romnesia has gone viral after Obama’s remarks in Fairfax, Va., which the Democratic president’s Twitter account used in a series of tweets.

“Now that we’re 18 days out from the election, Mr. Severely Conservative wants you to think he was severely kidding about everything he’s said over the last year,” Obama said on the stump in Virginia. You can hear and see the speech in the video below.

“He told folks he was the ideal candidate for the tea party. Now, suddenly, he’s saying, ‘What, who me?” Obama continued. “He’s forgetting what his own positions are, and he’s betting that you will, too. I mean, he’s changing up so much -- backtracking and sidestepping -- we got to name this condition that he’s going through. I think it’s called Romnesia.”

Obama then described the “symptoms” of Romnesia “because I want to make sure no one else catches it."

The president then riffed on comedian Jeff Foxworthy’s “You might be a redneck” routine when implying that Romney has forgotten his past positions on campaign issues.

“If you say you’re for equal pay for equal work, but you keep refusing to say whether or not you’d sign a bill that protects equal pay for equal work, you might have Romnesia,” Obama said. “If you say women should have access to contraceptive care, but you support legislation that would let your employer deny contraceptive care, you might have a case of Romnesia.”

Obama supporters have used Twitter to get #Romnesia to trend on the microblogging site. They include Vice President Joe Biden.

“Speaking in Virginia today, President Obama coined a new term to describe Mitt Romney’s deceptive policies: #Romnesia,” wrote Biden’s Twitter account.

“What is #Romnesia? When you etch a sketch everything you once believed until you make it up all over again. True Dat?” wrote Democratic operative Donna Brazile.

Not to be outdone, Republicans launched their own Twitter hashtag -- #Obamnesia -- to attack the president.

“If you call yourself a champion of women's rights while more women than ever struggle to survive in your economy, you might have #Obamnesia,” wrote the Mitt Romney Central Twitter account.

Conservative blogger Michelle Malkin did not tweet any of her own #Obamnesia posts, but she did help promote a few who participated in the hashtag.

“RT @atlasstumbled #obamnesia forgetting that you blamed embassy attacks on a YouTube video #Romnesia,” Malkin retweeted.

“If you say you want to close Guantanamo Bay, yet it is still open 4 years later, you have #Obamnesia,” wrote Troy Jurimas.