The problem is obviously. “Buuurrr” is too close to “boo” and if you chuckle the sound it will sound allot like “boo-hoo-hoo”.
Are you sure you are chuckling “buuurrr” and not “bherrr”, because the second one does sound like more of a mischievous chuckle. I recommend you analyze your chuckle and come back to us with the exact results as to whether it is indeed a “buuurrr”.
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