putting your balls on the table

To take high level of risks / be appear to be willing to back up words with actions / to be unashamedly frank about your intentions / motives / to put your money where your mouth is / to go all out

Man 1 "if you think this is going to work why don't you do it? come on put your balls on the table "

Man 2 "let me run it and i'l put in the fifty k you need"

Man 1"that's what i call putting your balls on the table"