I don't know very much Spanish, but it doesn't make sense.... here it says "Pocho" means.... pocho n. an Americanized person or thing of Mexican origin, including Americanized Mexican Spanish http://www.doubletongued.org/index.php/dictionary/pocho/ How does that apply to Lavezzi when A) Hes Argentine, not Mexican B) He has nothing to do with the USA.... maybe there are some Spanish speakers that know?
I remember them saying that it meant "loco" crazy because of his shirt number. It's like the Italian version where every number has a given meaning, for example 13 is Saint Anthony.
I remember during coppa America they called Cabiasso "el Cucho" all the time, wonder what that means.
Vincenzo Sivaio da Avellino: Vorrei chiedere a Lavezzi cosa significa Pocho, il suo soprannome. «Pocho non ha nessun significato particolare, non si può tradurre in italiano: è semplicemente un soprannome affettuoso. La traduzione nell’italiano fulmine? Non c’entra niente». it means nothing