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This phrase implies that someone did something obvious, and does not want to be questioned about it. It is used for telling someone that you do not want to talk about something because it was not good, pleasant, enjoyable, etc.
Don't Ask! Urban Dictionary. (n.d.). https://www.urbandictionary.com/define.php?term=don%E2%80%99t+ask.
DON'T ASK (phrase). DON'T ASK (phrase) American English definition and synonyms | Macmillan Dictionary. (n.d.). https://www.macmillandictionary.com/us/dictionary/american/don-t-ask.