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1.
The act of walking out of cover, stopping, slowly turning and killing your opponent in 1 shot

then in all caps typing "MERRY CHRISTMAS"

this is not just a seasonal greeting, it can be used all throughout the year
you are sitting watching your brother play an fps, a guy named ironman545 walks out from behind cover, turns 90 degrees very slowly and then shoots him in the head
your brother never fired a shot and you also had no idea what to do in such a situation
you both turn to eachother and say, that guy just santa claused us
by lildudespider November 08, 2009
 
2.
When a Male/Female Finger another woman or beats off a man and gets skeeted on their hand. They then apply skeet to partners chin and/or cheeks. Usually done when not wanting to see this person again.

Kyle Derosiers
Stephanie Cumbed on my hand so I santa claused her and she never did it again.
by Kyle Derosiers January 22, 2007