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
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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
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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
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