^ what they said.
If it is fuel, are you sure it was coming out of the muffler? Could it be dripping onto the muffler and running down it? Very dangerous by the way, don't run it with fuel dripping on the muffler, unless you are looking for a fireball.
Could have a leaky hose or tank that is sloshing over that way when you corner. I think there is a pressure relief/rollover valve near the muffler on some, if not all of the models.
If it is coming out of the muffler, Kik has put you on the right track.
If it isn't fuel, water in the exhaust is fairly normal (in small amounts, if a gallon pours out you have a problem). You may have a delivery problem. I'd suspect a clogged fuel filter or line. Maybe a bad fuel pump. Give the carb a sniff of starter fluid and turn her over, see if she wants to go. If it starts for a second I'd pull the line off of the carb (or fuel rail, if its injected) and put it in a bottle (not plastic) and have a friend give it a crank. If you have fuel pressure there its probably something in the return system. If that is clogged then your fuel lines will build up really high pressure.
May even be vapor lock try cracking the gas cap and starting it. Though in your OP you said you added gas and that didn't help so I doubt its vapor lock.
Let us know which model jeep you have and that will help diagnose it. Better yet fill out your Jeep profile.
Keep us updated and we should be able to help talk you through it.