To dream of a hamburger represents feelings about an indulgence in power that doesn't need to be sophisticated. Simple power that doesn't need to be intelligent. Enjoying something that lacks some intellectual, emotional, physical, or even spiritual component that makes you feel whole. An experience where you are aware of yourself enjoying not needing to be a hopelessly oversensitive loser.
Negatively, a hamburger may reflect easy sex without any emotional component. Waking life situations involving power, but leave you unsatisfied.
Example: A man dreamed of eating a hamburger. In waking life he was told he could marry a really beautiful girl, but because of her personality he was unsatisfied by the offer. The hamburger in this case may have reflected his feelings about enjoying the possibility of having sex with the beautiful girl, but feeling there would never be any intellectual or emotional connection due to personality differences.
Example 2: A 16 year-old boy dreamed of wearing a hamburger suit. In waking life he was projecting an overconfident attitude about his driving abilities to others before he actually had to take his drivers test. The hamburger suit may have reflected his feelings about trying to project a fake confident attitude about to other people to trust him as a good driver as though there was nothing overly sophisticated or serious about it.