The act of a woman recieveing sexual pleasure from two men at one single time
"Dude that girl is so hott but I heard she got double sacked last night."
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When two guys are fucking the same girl, one in the front and one in the back, and their timing gets messed up leading them to smack eachothers balls on the girl's taint
Me and Jim were fucking this chick the other day and he screwed up the timing and we ended up doing the double sack taint smack!
1. when you lock you arms around a persons neck and hang on their back, and then another person does the same to you.
1. we were in the pool when delinna jumped on alexis' back and yelled santa sack and then hailey did the same to delinna making it a double santa sack.