Cossintan
Another way of saying "you're ignorant!" but in a stronger way.
You're such a cossintan in music!
Cossintan
a person who lacks basic info. on an event.
Person A: I keep hooking my shot (golf)
Person B: Maby you should hit harder?
Person A: Shut up! You're such a cossintan!
Person B: Maby you should hit harder?
Person A: Shut up! You're such a cossintan!