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1.
put your money where your mouth is -
to support something that you believe in, especially by giving money
by DenFromKiev March 13, 2009
 
2.
'Put Your Money Where Your Mouth Is' means:
a) Practice What You Preach;
b) Back Your Intelligible Words And Intellectual Mind With Good Sound Judgement, Evidence and Proof;
c) You Yourself Would Not And Could Not Buy Your Way Through Life With The Rubbish That Spews From Your Mouth;
d) Go And Spend Yourself Acheiving Fruitless Pursuits, And Worthless Gain.

You can tell someone to Put Your Money Where Your Mouth Is as a rude derogatory gesture indicating that their speech is Nonsense or you can Invite and Inspire healthy competition for someone to proove and/or Instill their self-worth.

It stems from the idea that most people are Hypocrites.

Hypocrites are self-conceited people that have self-inflated views of themselves. They brag and boast about their Ideals but have 'No Idea on how to Achieve Results. They talk about things and say things that are contraditory to reality, and things that may contravene The Laws Of Humanity, Science, Maths And Religion - but that's just what I think. I have no proof where the idea stems from!!!
Here are 2 very different exmaples applied to 'Put Your Money Where Your Mouth Is', but viewed from a wider aspect rather than the personal level.

Example 1: Put Your Money Where Your Mouth Is Porche!
A Gesture To Invite/Inspire Healthy Competition.
Personal Observation: - Many Porche Car Owners have Money but no street racing skill to drive a Porche or race a Porche through the streets of London.

Example 2: Put Your Money Where Your Mouth Is Peacemakers and Lawgivers.
A Gesture Of Rude Derogatory Gestures And Speech.

Politics: Rude Derogatory Gestures And Speech that makes No Sense usually comes from the politicians, statesmen, world leaders and union officials when it's election time.

Their 'party manifestos and Speeches Indicate a fair policy for all. That is what they do, that is their job - to blind the poor and working class with fancy words that mean nothing. They pretend to care about real issues whilst the rich and educated are involved in Nutricide , Genocide and plunder.
by Ann O. Rack November 05, 2012
 
3.
Betting on a statement one makes to another
"you better put your money where your mouth is, I think you JUS B FIBBIN YO
by Bladeeblah December 08, 2007