K-Bombed
When someone yells at you online and you just say 'K' and then drop a bomb on them with proof they're a lying piece of trash.
You said I stole your lunch? 'K'... here's the receipt from the cafeteria.
You called me a fraud? 'K'... here's my college diploma.
You said I cheated on the test? 'K'... here's the camera footage.