To dream of a hummer represents decisions or self-control that totally lacks conservation. All resources and power are used to deal with problems or make choices. Being completely unwilling to compromise or conserve in a situation you are experiencing.
Positively, may reflect a strong level of motivation to use all your resources to solve a problem. Negatively, may reflect arrogance, wastefulness, or a total disregard for others feelings.
Example: A man dreamed of driving that was being fired on by guns. In real life he was suicidal and was using all his life savings to explore and find spiritual purpose.