Flacid Jack
When the porn or any other source of sexual pleasure isn't hot enough to give you a boner and your penis is flacid like a flap jack, but you still rub one off anyways.
"I was watching tub girl last night, but she didn't do it for me so I pulled a flacid jack just for the heck of it."
Flacid Jack by DjDM May 20, 2009
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