이건 뭐 병신도 아니고

This meme began to be used around 2005, primarily centered around communities like the DC Inside StarCraft Gallery. It is still consistently used in the form of image macros (jjalbangs) in online communities and is widely recognized, with instances of its use even in documents related to the Marvel Cinematic Universe.

'Igeon mwo byeongsin-do anigo' is an internet meme also known by its abbreviation, 'ImwoByeong'. It is used to criticize or lament a pathetic, hopeless, or utterly messed-up person or situation—in short, something "idiotic" or "stupid."

This expression superficially carries the nuance of "Why are you doing this, when you're not even an idiot?", and despite containing the word 'byeongsin' (idiot/retard), it is sometimes considered to have a relatively softer tone. Occasionally, it can even be interpreted as encouragement, like "You are capable of better actions, so please don't do this again." However, on the other hand, it can also be used with a stronger derogatory meaning, implying "Even an idiot wouldn't do this, but since you are, you're even lower than an idiot."

The most famous image macro for this meme is a composite image of Usami and Kumakichi from the manga 'Gag Manga Biyori'. A version composited with L from Death Note is also widely known. Interestingly, this line never actually appeared in the original manga. There are also derivative expressions that intensify the derogatory nature, such as 'Igeon mwo byeongsin-do matgo' (This is indeed idiotic), 'NeomwoByeong' (You are indeed idiotic), and 'NamwoByeong' (Am I an idiot?). Furthermore, the abbreviation 'ImwoByeong' is sometimes used as a backronym, expanded into phrases like "What kind of idiot is this?", "This is just idiotic!", or "What an idiotic situation is this...".

Ee-gun mwo byung-shin-doh ah-nee-goh

As this meme originated around 2005 in the DC Inside StarCraft Gallery, it was likely primarily used by young male internet community users in its early days. Currently, it is widely used in the form of image macros across various online communities, and is often recognized and used by internet users of all ages.

• It is used to criticize or lament a person or situation that performs absurd actions or leads to preposterous outcomes that are difficult to comprehend logically.
• Among close friends, it can be used to create humor by starting with "Igeon mwo..." (This is just...), pausing briefly, and then delivering "byeongsin-iguman?" (idiotic, isn't it?) as a punchline.

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Since this expression contains the direct expletive 'byeongsin' (idiot/retard), it can cause offense or sound insulting to others. Particular caution is advised when using it to disparage real individuals or specific targets, as it can be considered a derogatory remark. It is strongly recommended never to use it in formal or public settings.