I`d agree with translations given and i`d add that Forza can sometimes as well mean VIVA or so and as an exclamatory impersonal sentence `FORZA!` means `come on` as suggested above.
However,the exact translation of the word is STRENGTH,POWER,FORCE and in italian language a lot of expressions have been made exactly thanks to this word.
As for the song, DIECI CENTO MILLE (the one by Prezioso or Dj Brothers?) those are numbers TEN HUNDRED THOUSAND respectively.Note that word millE is singular form even though it ends in E and means thousand, whereas word millA is used in plural when we can speak about due/tre millA.
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