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That can be a bad sign. Seriously.
Here's a link for starters. Don't depend on Wikipedia for anything more than a starting point, though.
try it on pancakes
It can happen just from eating too much sugar, but if it continues, seriously see a doctor. Not worth messing around with.
If this has been ongoing, have a urinalysis and blood test. Metabolic diseases like diabetes can have a distinct sometimes sweet smell. Many cities now have lab places that you can have lab work done very affordably without seeing a primary care doctor if you wish.
I don't mean to offend you sir, but are you a tree by any chance?