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Verb phrase. To commit a serious faux pas when mingling with people completely outside your normal circle, especially when they're higher on the social ladder than you. From the caricature of a working class person getting confused by the extra piece of furniture in a better-off person's bathroom.
"Only demanded they heat up my gazpacho, didn't I?"

"God, you shat in the bidet there, mate."
by Dave June 19, 2004
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