I had heard this from someone . Actually that person used this sentence when she was going to eat a dish . It is related to food . What does it mean?
It means to begin eating something with pleasure or enjoyment. In American English the imperative verb phrase Dig in! is a rough idiomatic equivalent to the French Bon Appetit! It means to begin eating and enjoy. So, the given phrase I am so digging into it means that she is really looking forward to enjoying that food.