开黑

kāi hēi

(slang) (online gaming) to team up with friends in a coordinated private group (黑[hei1] indicates private, team-only chat)

开

kāi

to open (transitive or intransitive)

黑

hēi

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