1. An act within oral sex when the scrotum (sack) is licked continually up and down motion (sliding)
2. The act of travelling down an amusement slide on a sack
1. "I can make a guy ejaculate with a sack slide better than anyone else"
2. "Hey man, what are you up to tonight?"
"Heading over to Luna Park for the fun of a sack slide."
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