look up any word, like cunt:
 
1.
balls, testicles, nuts.
"His happy sacks were slapping her arse good and proper"
by stouffer and stuey November 10, 2002
 
2.
This refers to one's scrotum.
"yo bitch lick my happy sack"
"my happy sack is behr hairy"
by deadhill pimp April 16, 2006
 
3.
The little skin sporran that a male keeps his knackers safely locked up in.
"Oh Christ ... I've just been kicked in the happy sack ... I'll never have kids!"
by Wizards Sleeve June 07, 2005
 
4.
A small bean-filled ball which you lob around classrooms for fun.
Hey MJ, chuck me the happysack! I want a piece of that pie!
by Barry June 04, 2004
 
5.
Breast implants. After breast cancer, breast reconstruction gives a woman back her shape and confidence. Using saline or silicon, acquiring implants is a good thing! Slang for natural breasts are so affectionate; too bad so many slang terms for implants are negative.
"I got silicone happy sacks, and I feel curvy again."
by Curvy Cancer Survivor December 30, 2009
 
6.
bag of balls usualy two
my happy sack is bigger than my dick
by exstremeelvis.com December 04, 2002
 
7.
re-useable sandwich and snack bags now called snackTAXI
Happy sacks (now snackTAXI)like a ziplock bags but better for the environment
by KMurray February 23, 2009