What happens in Vegas stays in Vegas but if you aren't able to say you got a Fat Tuesday did you really go to Vegas? There are quite a few locations of Fat Tuesday store but I frequented the ones in the Miracle Mile shops and MGM because it was closest to Monte Carlo, where I was staying. The location in MGM was very hidden but it's near the lobby and if you ask for it they will guide you.
If you're new to this, no worries. The staff will give you some sample cups to try. If you like sweet cocktails, I'd suggest the fruit flavors and the pina colada. If you like to taste the alcohol, I'd suggest the swamp water or 190 octane. The Cat 5 is the best of both worlds because it's got a lot of alcohol but the orange juice covers it up.
Once you've decided on the flavors, you can choose the sizes. There are literally ones as tall as your body and ones the size of a football. I opted for the yard dog because it was the typical one you see people carry around. The first time you buy one it's $16 and every time you come back it's a $12 refill. W O R T H!! It's especially handy when you're lounging in one of the lazy rivers, sipping your drink and soaking up the sunshine.