What is Flacid Jack?
1.
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."
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when your new word gets rejected by the "editors" of urban dictionary, and then accepted 4 months later when some other jackas..
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When a female preforms a blowjob her male partner while she pees......
Yo man i was chillin with the trick last night bitch staight up ..