a term used to describe waving ones ballsack in a figure of 8, usually used as a form of insult or sexual entertainment. Also sacking around can mean general messing around..
Lewis: guys no messing around because imogen's parents might be here, okay?
max: can we sack around?
Lewis: no pisswilly but you can sack around
max: :7
* max starts sacking around*
max: can we sack around?
Lewis: no pisswilly but you can sack around
max: :7
* max starts sacking around*
by Midget prawnography June 28, 2011

by Rob E. Beckett September 30, 2009

I knew I was too late for a sack swipe when I dropped my shorts to urinate and could smell my own nuts.
by Farkus Cluck May 10, 2008

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
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."
2. "Hey man, what are you up to tonight?"
"Heading over to Luna Park for the fun of a sack slide."
by Camicca October 7, 2011

by mackenziesvirginity July 24, 2022

when you go at it so hard that your balls get hard as well. the thrusting & smashing that goes on for hours becomes so exhausting. you stand there, in & out. when you finally release your steamy, hot, cum it shoots through that pussy & that shit becomes a flapper. the moans are immaculate, echoing off the walls around you. after this type of orgasm your nuts will never be the same. & the chick you smashed will have a grandma cooch for life.
zoe: dude i smashed andrew so hard last night, he gave me a flapper! turns out at the end of that, he had a hard sack!!
theodore: mmm
theodore: mmm
by flappy_cooch_69 April 23, 2020
