When one defecates while standing on their head, and lets the fecal material slide across their scrotum to fall. The resultant fecal 'snail trail' is dried with a hair dryer and peeled away, resulting in a dried feces chip.
"I was so constipated I almost passed out making my sack biscuit."
by Uncle_Scary May 6, 2010
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A biscuit (Americans would call them cookies) that has been finely rubbed by the scrotum of a bull. Specifically not a human scrotum, as this is unethical.
Person 1: yo what kind of biscuit is that bruv

Person 2: Sack Biscuit. Have a try mate.
by Monkey Whisperer November 2, 2020
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