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Mặt lồn is a harsh Vietnamese slang insult typically used to express strong anger or disrespect toward someone. Literally, the phrase translates to “pussy face,” referencing a private body part in a crude way. In everyday usage, it functions like an aggressive term for someone seen as annoying, rude, or stupid. It is considered extremely vulgar and should not be used in polite situations or toward people you don’t know well.
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