Tsyeeaahh
The half-laughed "yeah" you give people after using your 3 allotted what's when speaking to a person and you don't understand what they're saying, typically used for the elderly and foreign people.
Lawrence: My cat died.
Chad: Huh?
Lawrence: I said my cat died.
Chad: What?
Lawrence: My cat died for Christ's sake!
Chad: Sorry?
Lawrence: Wow... Young people
Chad: Tsyeeaahh
Chad: Huh?
Lawrence: I said my cat died.
Chad: What?
Lawrence: My cat died for Christ's sake!
Chad: Sorry?
Lawrence: Wow... Young people
Chad: Tsyeeaahh