Bachi's literal meaning in urdu/hindi is child (female), but it is widely used as a word for girlfriend as a slang. It actually started with the movie 'Pyar kiya to darna kya' when arbaz Khan (Kajol's elder brother), used to call Kajol as 'bachi' in front of Salman khan and asked him to stay away from her. Since then the widely accepted word for cute girls became 'bachi' which later became a generic word for girlfriend.
Boy1 : Tu ne homework kia?
Boy2: Nahi.
Boy1: Bachi ki kasam kha
Boy2: Han kya hai, yele.
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