American, Aussie, and Kiwi Chatting It Up Quickie

Listen up, chucklehead! You think you're so smart, huh? Well, let me break it down for ya. The joke is a play on word. When an American speak with an Aussie and a Kiwi, the American is asking 'What do you say?' But the punchline answer as if the person is asking 'How many Aussie are there?'