I first presented this “U”-phemism–first cited by the OED, appropriately, in a 1940 Nancy Mitford quote–as a Portland, Oregon, outlier, but I now believe it’s made the grade as a NOOB. The Google Ngram chart, below, shows a more than 50 percent increase in U.S. use between 200o and 2008:
Then there are these recent quotes:
I saw Another Happy Day, and thought you really brought it home playing the bitch ex stripper, coke-whore mom — nearly spitting nails with every word catapulted at your co-star, Ellen Barkin. That cat fight in the loo alone was worth the price of admission (“An Oscar-Themed Open Letter to Demi Moore,” Huffington Post, February 28, 2102)
SUSPECTED PEEPING TOM HITS CAMPUS LOO (Coast Report Online, Costa Mesa, Cal., February 21, 2012)
…it’s no longer the morning news that dad is reading on the loo, but rather a tablet computer. (Consumer Reports.org, February 17, 2012)
I can’t top that, so, like George Costanza and Mitt Romney, I will just say:
No pun intended.