Top Definition
The act of pulling excess scrotal skin over your soft penis and and pressing on the exposed base of the penis and as the penis flings out of the sack wrap you say cha ching mocking the sound of a cash register
"Dude he was so drunk that he made a sakpak and put on a "sack register" for us it was so funny
by Bighair15 March 13, 2010

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