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Da "uh-uh" response dat someone gives by swiveling their head back and forth several times.
If someone is less than intensely-vehement about declining whatever is being requested/suggested, he may just silently perform da "shay-kuh, shay-kuh, shay-kuh, shay-kuh!" routine, rather than resorting to da more-noisy lips-spluttering dissent like he would if he was acutely distressed/horrified at said proposal.