When the bill came, we all had to 'pony up'. [='pay up'] = We all had to 'pony up' for the bill.
As a knitter, I'm a 'one-trick pony': I can only knit scarves.
a musician who was a 'one-trick pony' and then faded away
(..) - Oh, boy, a parade! - An actor's life forme Hi diddle dee dee An actor's life forme - Huh? - A waxedmustache anda beavercoat - A pony cart anda billygoat Hi diddle dee dum - Why, it's-- it's Pinoke. Hey! - An actor's life is fun - Where you goin'? You wearyourhair in apompadour (..)1940 Pinocchio