A Melonmag - A weird creature that comes out at night. People use it as a

A weird creature that comes out at night. People use it as a curse word for something they really hate.

'That test was a melonmag!' I said after I failed it three times.

My mom called my brother a melonmag because he ate my sandwich.

My friend said the math teacher was a melonmag because he gave us 50 problems.