Perhaps you mean the french, faux pas, which translates as false step. it is pronounced similarly to what you wrote and does mean a mistake. It could be referred to as a faux pas yes :) but, in most cases no, a faux pas is more of a 'no go' What is the slang word used to indicate happy A common slang word used to indicate happiness is lit. it conveys a sense of excitement or joy, often in relation to a fun event or good vibes.
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