There were a number of phrases that we thought about including in the book but in the end we did not.  Here is one:

Pony Up

There are different theories on the origin of this phrase, but the most common is that Pony refers to a small amount of money that must be paid. A Pony is a small or young horse. This fits with its widespread use in poker for putting your small ante in to join a game.

The phrase Pony Up might also come from the German ‘poniren,’ ‘to pay.’ A Pony is also used to describe a small alcoholic drink and there is the pony keg of beer.

Feel free to add your 2 cents.