Using Euro coins as weights (2004)

I think it's worth noting the currency term 'peso' for the money used in a lot of former spanish colonies, directly translated, means 'weight'. For example there's a famous mexican singer of recent who goes by 'peso pluma' and it means featherweight, like the boxing classification, not as much to do with money

It could very well be a pun to do with how he gets money, though. Wiki says he makes narco music, and bird references are common to drug slang in both US English and (Mexican) Spanish.

Juegos de palabras for sure