To make haste; to exit conspicuously. Generally used when somebody does something wrong and wishes to avoid embarassment or trouble.
For example:
- "OK, I managed to stuff a dozen boxes of tapioca pudding mix and several large pieces of plywood into my pants. Now, let's get the hell out of Dodge before the store detectives start trailing us."
- When your passenger exclaims, "Dude! You just ran a red light!" the appropriate response would be, "Then it's time to get the hell out of Dodge before I get pulled over!"
The etymology of the phrase refers to the lawlessness of Dodge City, Kansas, during the late ninteenth century. When things got particularly rowdy, many people thought it a good idea to get the hell out of Dodge. It was also uttered in the Errol Flynn western Dodge City. | 
