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1.
A word of Indian origin defining a Good-For-Nothing bludger. It literally translates into "unworthy", or "worthless".

Often used as a popular insult by indian parents to their kids when they are caught doin something useless, shameful or unproductive.
Indian dad: Beta, what are you doing there?

Son: Just talking with friends and smokin a little bidi dad.

Indian Dad: Ohh my son is a nalayak!!
by $harnam July 31, 2006