stone up

To find some courage.

Dude, quit being a pussy. Just stone up and do it!

stone up

To behave boldly. To act like a man and rise to a challenge

Seat 7: Come on, if you straddle this bet, I'll blind raise $15.
Seat 6: I don't straddle, besides, $15 is too small.
Seat 7: Well what do you want?
Seat 6: Stone up and bet $50