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1.
The act of two males masturbating feverishly and ejaculating all over each others ball sacks. The resulting cream covered hairy sacks is known as "santa beards".
guy 1 "Oh man I was so drunk last night what happened?"
guy 2 "I think we gave each other santa beards."
guy 1 "That's why my underwears all stuck together."
by Mikhailo Meersmachov December 26, 2010
 
2.
When you skeet in a guy's beard.
It was Christmas Eve, so I thought it would be fitting to give this guy a Santa Beard.
by Dave Winks December 06, 2004