(And i'm pretty sure desu means 'I am' in Japanese so what you literally just said was 'I am I am' rawr xD)
"Desu" means "is", but some refer it to as the sound you make, when you're playing tough, or just being an annoyance x3
"HAHA, WA ANATA NO KASA O USHINATTE IMASU" means "Mother. you've lost your umbrella", and "WATASHI HAHA OCASA" means "I violate (you) mom" x3
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