a slang term applied to an informal group of Jewish adults who congregate during the Sabbath prayer services to make kiddush over wine or liquor, and socialize. Traditionally it has been a male-bonding experience.
JEW1: "ready for Kiddush Club?"
JEW 2: "Yaakoff, get the Henny, yeshiva, reveal your garments at once!"
A word similar to childish, used to define someone who acts like a kid in most cases. However it does not have to mean immature but simply acting like someone of a young age, or showing something that relates to a kid.
Examples:
My girlfriend wanted me to go to the playground with her then go back to her place and eat cookies and milk to me that just seems kiddish.