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The annoying, baby-like way of begging for a cookie. Used by people who think they're cute, but are really just a pain in the ass.
My little sister texted me: 'I can has a Cookie?' and I threw my phone at the wall.
My coworker asked me during a meeting: 'I can has a Cookie?' and I almost yelled at him.
My dog barked at me like he was saying: 'I can has a Cookie?' and I gave him a cookie just to shut him up.