When something is considered to be legit and delicious. Often used at times when you want to describe a certain thing that you consider legit (good) and tasty.
Oh man that chocolate croissant from that bakery the other day was so legitalicious, I wanted at least a dozen more.
Often used in text messages as form of slang. A mixture of "legit" and "literally", can be used in certain situations on a daily basis when put into context, the term is usually used to emphasise and convince the listener/reader.