The act of understanding someone or trying to understand someone while they are yawning and talking at the same time.
Mike- "ajdjkf jfsjaj fjsal?"
Jake- "Dude! What the Fuck are you saying?!? I dont Speak Yawnish!"
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The almost-language-like noises made when a person attempts to speak while yawning.
Person 1: "Paaaa m th sawwwww."
Person 2: Stop that! You know I don't speak Yawnish!