We have a 'fifty-fifty' chance of succeeding. [=we are as likely to succeed as we are to fail]
The bill for dinner came to $43, and she gave him a 'fifty'.
They divided/split the expenses 'fifty-fifty'. [='equally']
(..) And seein' them ev'ry day, day in day out, I… I only had one question. Why don't they kill us? Now right up there on that porch… three times a week for fifty years, Ol'Ben here… would shave my Daddy with a straight razor. Now… if I was Ol'Ben, I would have cut my Daddy's goddamn throat, and it wouldn't have taken me no fifty years to do it neither. But he never did. Why not? You see… the science of analogy… is crucial to understandin' the… (..)2012 Django Unchained