when you see someone that you haven’t seen in a long time and you recognize them in delight.

A viral song (google bish wha song) where the girl says bish wha, bish wha!?!? It's featured as background music in many vines and insta-vids. It essentially is used in situations where the one saying "bish wha" is surprised.

It's the same as bitch what, but with swag.