spectrum:Peeing has little to do with it.
Your suit has accumulated a bio-load of the aquatic food chain and it is rotting. Perfectly normal progression, happens to all suits eventually.
You need an enzyme product that will deal with this. There are dive shop items such as Myrazyme (sp?) and sink-stink that you soak your gear in a dilution of. Remember not to rinse after soaking, you want this stuff in/on the suit through the drying process. You can also buy domestic product such as capet cleaning solutions to deal with odor, look for enziyme based products.
Pete
Follow spectrum's advice and your issue will be gone (great advice - does not get any better)