Other than this Oregon sighting (which came courtesy of Nancy Friedman), and in crossword puzzles, loo is not seen or heard much on these shores. An exception is this from an August 2011 New York Times style blog, about a country cottage: “You flush the loo the old-fashioned way — with buckets of water hand-pumped from a spring.”
But this is a Britishism that should be more than one-off. Now that john is antiquated, we don’t have a one-syllable term that’s neither euphemistic nor explicit. So let’s go loo.
And in any case, those stick figures are brilliant.