also: ジーケー · ジーケイ
He plays as the goalkeeper on his high school soccer team.
They quickly restarted from the goal kick.
Who's coming to the mixer this time?
The ball went out of play, so the match resumed with a goal kick.
A senior invited me, so I went to a mixer with students from another university.
ＧＫ is a rare slang abbreviation for 合コン, the everyday term for a group mixer or blind date party among students.
Abbreviation derived from the initial letters of ゴールキーパー (goalkeeper), ゴールキック (goal kick), and 合コン (joint party). The reading ジー・ケー reflects the English letter names G and K.