A nonsensical catch-phrase attributed to [[Patchouli Knowledge]] of [[Touhou]].  It is the onomatopoeia of a groan combined with a sigh.

It can be used to pun out profanity, instead of saying "[spoilers]f*ck[/spoilers] you", it says "muck you" (example post #575062)

h4.See also
* [[koa (phrase)]]
* [[myon (phrase)]]
* [[patchouli day]]
むきゅー