Jackswig
A lie that's so fake it's like wearing a clown suit to a funeral
He said he was a famous singer. That was a jackswig. He sang in the shower and it was terrible.
She said she had a perfect GPA. That was a jackswig. She got a D in math and a F in science.
My uncle said he was a knight. That was a jackswig. He wore a cape and tripped over the dog.