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4.
The rate that you lose weight. Thin people are bitches about it and say that it means nothing.
Example: Josh cant lose alot of weight because he doesnt have a high metabolism
by usaf0403 November 19, 2005
 
1.
The sum total of all biochemical reactions that occur in a person's body. Digestion of food is just one aspect of metabolism.

Divided into catabolism, where organic molecules are oxidised and degreaded to prodice energy, and anabolism, where small organic molecules are combined to form larger ones at a cost of energy.
My last biochemistry exam was all about metabolism.
by Darth Ridley November 09, 2006
 
2.
A word that fat people do not understand. They use it as a scape goat for their fat asses instead of admitting to their own laziness.
"It's hard for me to lose weight. I have a slow metabolism."
by Koondogg Saints July 13, 2004
 
3.
The rate at which food is digested.
I have a fast metabolism, so I don't get fat when I eat 16 kajillion tons of food everyday.
by SykoSniper June 14, 2004