I wish I didn't like Fat Tuesday as much as I do. I really really wish I didn't...because walking around with these massive slushies is slightly embarrassing, the most basic, and way too typical all around the Strip. But that being said, I feel like Vegas isn't the same without making a stop here at some point.
You have a ton of size and shape choices as well as a lot of drink options: my favorites are the Mardi Gras Mash, Hurricane, Electric Lemonade (mainly because it's blue), and Strawberry mixed with either Mango or Pina Colada (yes, you can mix multiple flavors)! These are all pretty reasonably priced but I would suggest adding an extra shot for a few dollars if you're trying to get drunk on a slushy and because it's a better bang for your buck. Also realize that these are SUPER sweet so it's hard to drink a full one if you get one of the comically large cups...the extra shots help though!