In medium-sized bowl, add flour, salt, oregano. italian seasoning and garlic powder. Whisk well to mix. Add beer and whisk in just until mixed. Set aside.
Cut leftover pizza slices into 2-inch wide pieces from the crust end. Place a damp paper towel, if needed, onto a plate, place slices on top, and microwave on High just until crust is pliable and cheese has not remelted. (If it does, it's ok. It will cool back down.) Starting from pointy ends, roll up and secure with tooth-picks. Let rest and re-cool.
In dutch oven or very deep frying pan, heat pan of oil that's filled 2 inches deep. Once oil is hot, (*test with a tiny bit of batter), remove the tooth-picks from the rolls. Holding the rolls together so that they don't unravel, totally coat them well with the batter and carefully place into the hot oil. (Don't overcrowd, only fry a few to half at a time.) Fry until the rolls are deep golden browned on all sides. Remove to a cooling rack placed over a baking sheet.
Warm your dipping sauce, and serve sliced in half from crust end to show spiral inside and for ease of eating. Serve with warmed sauce and enjoy!