Eter-Eter

Pronounced as (een-r) And is normal used to annoying the crap out of people. It can also be a very squeaky and high pitch noise. Many people use it as a noise to make when they are bored or in an awkward situation.

Elena: Sooo...
Angelina: Yeah....
*awkward silence*
Angelina and Elena: ETER-ETER!!!