A
hesitation noise in the
Japanese language.
An alternative for Japanese speakers would be
"etoo..."
I would
approximate it to the English "Uhh..." or "Umm...".
The "noo" is not pronounced as in the English "
noose", but is instead an example of
long vowels in Japanese. Were it to use a short vowel sound instead, it would be written "
ano".
Anoo can be alternatively written in romaji as anou.