what does it mean?

意思係:

whatever will be will be

係咩文, 其實都爭論左好多年...最有可能是意大利文或西班牙文, 法文都有人講:

There is some doubt about the language of the song's title. According to information on various discussion groups online, the allegedly Italian origin ("Che sera, sera", the family motto of a character in the 1954 film The Barefoot Contessa) is spurious. "Che sera, sera" is grammatically incorrect in any modern Romance language. The Italian would be "Che sarà, sarà", whereas in Spanish it would be spelled "Qué será, será".

"que" means what in English
"ser" is the verb to be in English
"sera" could be humans

so que sera could mean "Who someone is"

2006-12-21 08:23:03 補充：
I based on Spanish to translate these words

sera 係serum的複數 and serum means 血清

Well, i don't think think that is english , i think that is spanlish