Ouff (おうふ)

It is a letter of an imitation that is imaged as "Otaku is about to come out" when asked something.
It is said to have a meaning to emphasize "otaku" and deride.

For example, "Ohu www Kitakore www" "Ohu www this is a nice Zako www" is used, as a nuance it may be similar to the feeling of emitting "oops" including surprise and laughter.

元ネタは2008年の2ちゃんねる（現：5ちゃんねる）への書き込みと言われている。
From the interaction that otaku imitates "like a geek who is not familiar with geeks, it is an otaku", it spreads on the net.

Similarly, in the case of onomatopoeic letters, "Fokanupou" "Ngo" "Dukushi" "Fuhihi" and others.
Also, in 2012 "Seventh Otaku Senryu Ueno Grand Prize", Sawayanagi with only an onomatopoeia "Dufufkopo Ohifdopofokanupou" won 4th place and became a hot topic.
Let's write with the rhythm of five, seven and five.