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A monkey trying to hump a football while it's on fire and covered in glitter. Basically, you're screwing something up so bad it's like you're trying to juggle flaming turds with your feet.
My math test looked like a monkey was trying to hump a football while it was on fire.
He tried to fix the printer, and now it's just screaming at him.
She attempted to make a sandwich, and now the kitchen looks like a war zone.