The sound an airplane makes. Can be yelled at quiet moments to freak people out. Can also be used to end awkward silences. Is sometimes followed by "I'm going in!"
Acronym for "not yeah", usually used as a sound of discontent, especially when someone does is not enthusiastic about something another person has said.
A mixed answer with the first Letter of No with Yeah altogether in fact a Negative answer in Four Slavic Languages: Belarusian, Polish, Russian and Slovak