Pacchio - A girl so clueless, she thinks getting a B is a win. Like a

A girl so clueless, she thinks getting a B is a win. Like a kid who thinks a toy is a prize.

'She's a Pacchio and still thinks a B is good.'

'He said she's a Pacchio because she got a B and cried.'

'She's a Pacchio and thought the teacher was mad at her.'