shaky start????

They are our friends. They've been together for 6 months already and they are professional dancers. One day, the six of us decided to meet in a restaurant to have lunch. They were there already when we arrived but they were standing in a corner seriously discussing about something. We cannot order our food because we were waiting for them and then suddenly they started crying and embraced each other tightly, and then we overheard them saying "We had a shaky start....." the four of us looked at each other with wonder.....I suddenly said" whatever that means I am already starving as I waved the waitress.....