Someone who is being unpleasant, miserable or un- cooperate on christmas or during the christmas season
'Oh come on dont be such a scrooge'
'I hate christmas'
'Have some christmas spirit'
'Dont be so miserable'
'Christmas is the worst holiday in the year'
'You're scrooging it up'
If a person is miserable throughout christmas with no valid reason they are 'Srooging it up'