Top Definition
The act or practice of marking the nut sac with indelible patterns, pictures, legends, etc., by making punctures in it and inserting pigments.
"I don't know man, but for some reason I've always wanted a tattoo."
"You know what I've always wanted, right?"
"what?"
"A fucking sactoo."
"What the hell is a sactoo?"

"It's a tattoo that goes on your nut sac...its a sex thing."
"...You're fucking weird, man."
by t.aikman_8 July 03, 2012

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