A mixed social gathering or mixer (often between male and female groups) held for meeting people or socializing; abbreviation of 'gōdō konpa'.
今週末、友達と合コンに行く予定だ。
I'm planning to go to a mixer with friends this weekend.
合コンで知り合った人と付き合うことになった。
I ended up dating someone I met at a mixer.
合コンは初対面の人が多いから、自己紹介をしっかりしよう。
Since mixers often involve many people meeting for the first time, make sure to introduce yourself properly.
彼は合コンがあまり得意ではなく、いつも早めに帰ってしまう。
He's not very good at mixers and usually leaves early.