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A loud, messy way of showing you like someone, usually when you're too drunk or too stupid to think straight.
I saw him at the bar and just started hachee hachee-ing like a madman.
She texted me 'I'm hachee hachee-ing you in the lobby' and I ran there like a fool.
We were hachee hachee-ing in the middle of the grocery store and got kicked out.