Background below. A one word solution from the kiladian language for the term "I know you just didn't." This is often used as a reaction to unruly actions or assaults of character.
1.) Then came the whily tiger as he stepped upon the plains of the willapadoo mountain range. Evil roosters crowded out upon the step of Cornelius' abode known as Kiladwa, named after an ancient pie passed down for generations, until it was eaten. The devourer of the pie soon died and was named Asleslem, meaning "I know you just didn't."
Person 1: I forgot to do my homework.
Person 2: WTF JIMMAY WTF. ASLESLEM!