Pronunciation: [dˈʌ] (IPA) 
The word "DUH" is often used sarcastically to suggest that a statement or question is obvious or stupid. Its spelling is based on the phonetic transcription /dʌ/, which represents the short vowel sound in the word "up". The letter "h" is added to create an audible release of air after the "d" sound. This spelling is a reflection of the informal and playful nature of the word, which is commonly used in casual conversations and social media.
Duh is an interjection used to express sarcasm, incredulity, or mockery at someone's obvious or foolish remark or action. It serves as an informal way of stating the obvious and is often employed to highlight the speaker's disbelief or disappointment in the other person's lack of common sense or awareness.
The term originates from American English and has gained popularity in informal speech, particularly among younger generations. It is often accompanied by a mocking tone or an exaggerated roll of the eyes, emphasizing the speaker's view that the information being highlighted is blatantly apparent.
The usage of "duh" can vary depending on the context and intention. It can serve as a direct response to a statement that appears to be completely evident or redundant, adding an element of mockery or condescension. It may also be used more subtly, with a hint of sarcasm or irony, to point out an obvious flaw or fallacy in someone's argument.
Overall, "duh" functions as a short, emphatic expression conveying incredulity or disdain for a lack of basic understanding or logic. While it may be considered somewhat impolite, it has become a common part of casual, informal speech, often used humorously to accentuate the obviousness of a situation.
* The statistics data for these misspellings percentages are collected from over 15,411,110 spell check sessions on www.spellchecker.net from Jan 2010 - Jun 2012.
