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1.
Short for Slap Jack Nut Sack. He has his ups and downs in counter strike and it all depends on how much sex he is getting, and how good it is.
a)OMG I HAVE A SCORE OF 25 AND 1 AND I GOT LAID 5 MINUTES AGO!

b)OMG I HAVE A SCORE OF 1 AND 25 AND I GOT LAID 5 MINUTES AGO!
by Slap Jackin November 30, 2004