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When you use your sack to do the dirtiest, most awkward sex act ever. It's like a foot job, but with more shame.
My math teacher caught me hackie sacking during a test, and I got a D for my trouble.
My uncle and his friend were hackie sacking in the park like they were in a porn.
I tried to hackie sack my crush, but it was more尴尬 than sexy.