Of or related to the styles, community, culture, or behaviours of Mongkok, a Kowloon neighbourhood in Hong Kong known for the alternative crowds it attracts such as punk, hipster, goth, and other non-traditional subcultures. The neighbourhood is often compared to Harajuku in Tokyo or even a Williamsburg, Brooklyn, NYC.
"Do you really wanna buy those black boots? You'll look so MK if you wear then with tight ted jeans."
Standing outside the MTR station while smoking and playing with your handset is so MK"