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1.
Buying someone something less for Christmas because they didn't buy you anything for your birthday or a past event.
Ex. Carl: "Hey Danny, can I have a beer, It's my birthday after all?"
Danny: "No, I already gave you one yesterday."

(Carl goes home)

John: "So hows it going?"
Carl: "Not too good. My friend's such a cheap bastard. I think this Christmas I'm a be Scroogin' a little bit."
by TheScrooge November 24, 2010
 
2.
Detesting Christmas, and all its related cheer.
Hey man, what are you up to for Christmas?

Scroogin'... alone.

Wow. what an asshole.
by scroogemcduck December 25, 2011