jaard
When you're so stunned by a lie, you say 'jaard' like it's the end of the world. You stretch your arm as long as you can, like you're trying to reach the end of the universe.
'Jaard! You said you'd never eat that spicy chicken again!'
'Jaard! I just got scammed by my best friend!'
'Jaard! You said you'd pay me back, and now I'm out $500!'