Top Definition
adjective: manner of acting or speaking in which someone sounds like an idiot, but thinks they are sophisticated and spot on; derived from the French language meaning ignorant pretention

noun: gross exaggeration or misinformation spoken with an air or belief of cosmopolitan, cultured or urbane worldliness

pronounced "id-ee-o-SHAY"
She thinks she's so smart and savvy. The things she says are completely off-base and idioche.

What a bunch of idioche! She doesn't know what she is talking about!
by pPOSH October 08, 2010

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