A playful "being sociable" game where ya "layeringly" stack up yer hands with those of one or more friends, then ya yank yer "bottom" hand out from da pile and place it on top of da stack of hands, then the next person yanks his hand out from da bottom of da stack and places it on top, and so on.
I love playing circle of friends wif all da pretty girls I meet in da town square, but if we have da use of a picnic table or other elevated flat surface, I also enjoy sharing a round or two of hand-stack wif da cuties afterwards --- nuthin' quite so good at bringing da delighted/amused giggles outta dem.
A modest streaker using one free hand to cradle his testicles, propably from fear of having then squished or busted by his legs. This word was probably coined by Daniel Tosh.
The act of rubbing your own hand around your sweaty ball-sack, then shaking someone else's hand with the aforementioned hand smothered in bollock sweat.