BCiT, n: Bus chick in training. A young person, usually under the age of 12, who is learning the bus-riding ropes. A BCiT always rides with an experienced bus chick while she masters basic bus survival skills, such as when to ring the bell, how and when to pay, and appropriate bus behavior–and then more advanced skills, including schedule-reading, trip-planning, and street safety. If she shows promise, she is permitted to ride without a mentor, and, eventually, initiated into the sisterhood of full-fledged bus chicks.
In the Bus Bag
Unaccustomed Earth, by Jhumpa Lahiri