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Can only be performed when it is very cold. A man's ball sac must be cold and pulled up very tightly. A girl then puts the man's balls in her mouth and sucks them until they are warm enough that they become very saggy again. The girl cannot take the balls out of her mouth until they are completely saggy, otherwise it is not a true Siberian Sack Lunch.
After we went snowboarding all day, I gave my girlfriend a nice Siberian Sack Lunch.
by KenyanSlumberParty February 20, 2009
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