Racial epithet, a set of noises made to approximate Chinese, or other Asian languages. Not an accent. Derogatory. See chink, chinaman, oriental. Used by Rosie O'Donnell on The View to mock Asians.
"You know, you can imagine in China it's like, 'Chingchong, chingchong. Danny DeVito. Chingchong, chingchong-chong. Drunk. The View. Chingchong.'" - Rosie O'Donnell