To ker is to introduce two close, even intimate, friends from completely different spheres of your life, and watch them fall madly in love, within days.
Person A: Wait, isn't that your office mate and your second grade teacher off making out in the corner?
Person B: Yeah, I had a barbecue for my birthday, and invited a bunch of different people who knew me, and before I knew it, I was kering half the people there. My racketball buddy ended up with my dentist, too...
Person A: Wow, a double-kerin at one party? AWESOME!