Hark at
Definition 1 of 1
Pro Tip 1/3Surprised Tone
Use 'hark at' to express surprise, often with a hint of mockery or irony. 
Hark at her, suddenly an expert in quantum physics!
Pro Tip 2/3Colloquial Usage
It's a casual phrase, most fitting in informal conversations among friends or acquaintances. 
Hark at you, have you become a gourmet chef overnight?
Pro Tip 3/3British Slang
Remember, 'hark at' is British slang; it's not common in American English. 
Hark at the Yank trying to use British expressions!