Been to Fuzzy's several times - what ASU student hasn't?! It's honestly great for a cheap meal - the food isn't particularly outstanding, but it fills you up and it feels good going down. You can get a huge margarita or beer for about $5 (or less - I can't remember the exact price), and you have to try one of their signature beer-ritas at least once (they stick a mini bottle of Corona upside down into your margarita)! The Sun Devil beer-rita is my favorite - the mango flavor is awesome.
There's a little bit of inconsistency with how the tacos are made - I've gone some times when they've been very dry and light on toppings, other times when they've been so overflowing that I literally can't pick them up, and others when they've been just right. You can't complain too much for what you're paying. Taco Tuesday is discounted tacos - be ready to wait 10-15 minutes in line! Ample seating, though, so don't worry about getting a table.
Fuzzy's for the win!