jaard
When you're so shocked by a lie, you say 'jaard' like it's the last word you'll ever say. You stretch your arm as far as you can, like you're trying to touch the moon.
'Jaard! You said you'd never eat that slimy green stuff again!'
'Jaard! I just got fired and you told me I was getting promoted!'
'Jaard! You said you'd pay me back, and now I'm out $200!'