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Possibly related to Dutch puber.
пу́бер • (púber) m
- (slang) a pubescent boy
- “пубер”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
- “пубер”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Chitanka, 2010