factitious fever
Faking a fever with some dumb stuff. You might use heat or weird chemicals to make the doctor believe you’re sick when you’re just trying to get out of trouble.
I used a match to heat the thermometer. It was a fire hazard and a fake fever.
My brother used hot pepper juice on the thermometer. It was spicy and fake.
She used a cup of hot soup to trick the doctor. It was gross and clever.