When you get road-head so good that you climax and accidentally yank the parking brake while driving.
You know road-head is good when it turns to a parkjob.
When a man is having sex with a woman and he inserts his dick in and leaves it there, no thrusting required, ocassionally doing one thrust.
"Yeah dude, I gave Sandy this wicked parkjob and she slapped me."
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When you park your car then get a blowjob.
"Kevin got a hell of a parkjob last night."
"Sorry I'm late. I ran to WaWa and got a parkjob."
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When a man and woman are having sex, the man takes a dump on his partner's chest. With the shit in place, the man turns around and parks it between her tits like a bulldozer for poo.
"I tried to surprise her with an Italian Parkjob, but she knew something was up when I tried to take a dump."
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