(n., english) A term to describe an awkward or uncomfortable situation, usually because of suggestive wording. Stemming from the fantasy creatures in the anime film "Nausica of the Valley of the Wind," the term was coined to due the ohmu's questionable behavior. Often when an ohmu-worthy situation arises, it is expected that one will rapidly move their fingers while holding their hand under their chin.
(note: The following is a purely hypothetical situation. Any persons finding a likeness to these characters have merely been subject to coincidence.)
Mimi: I like Pocket Tanks! (the popular 2D tank game)
Tim: Pocket Tanks? Now I won't be able to get any sleep tonight... Interesting, but disturbing.