A Melonmag
A smelly monster that hides in sewers or under your bed. You can use it to call something really stupid or annoying.
'Your math homework is a melonmag!' I said after I had to do it for a week.
My sister called my dad a melonmag because he snored like a dragon.
My friend said the teacher was a melonmag because he gave us 100 problems.