Long time no see
Definition 1 of 1
Pro Tip 1/3Casual Greeting
Often used in informal contexts among friends or acquaintances. 
Hey, long time no see! Let's catch up over coffee.
Pro Tip 2/3Positive Surprise
Implies a cheerful surprise at unexpectedly encountering someone after a long time. 
Alice! Long time no see! I didn't expect to run into you here!
Pro Tip 3/3Verbal Smile
Use it to express friendliness, like a smile would in conversation. 
Long time no see, my friend! Your smile is as bright as ever.