黑不溜秋

hēi bù liū qiū

dark and swarthy

hēi

abbr. for Heilongjiang province 黑龍江|黑龙江[Hei1 long2 jiang1]

no; not so

liū

to slip away

qiū

used in 鞦韆|秋千[qiu1 qian1]