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A super rude way to tell someone they're lying or not going to do what they said they would. It's like giving them the finger with your mouth.
You said you'd bring the pizza. Hai ca da? I'm still waiting for my dinner!
He promised he'd clean his room. Hai ca da? It looks like a tornado hit it.
She said she'd come to the party. Hai ca da? I saw her at the mall with her boyfriend.