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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a load of cum produced at orgasm that is shot up in the air and caught in ones mouth
this fine ass bitch was jackin me off and I busted..