Messing around, especially when it comes to a job or important activity. Could also be a reference to beating a dead horse when it comes to getting a machine or important piece of equipment to work.
Steve said that Dave was jimmy jacking around so he got yelled at. Because Dave's a lazy fat nerd and nobody likes him.

Look I'm not going to jimmy jack around with that head gasket, just get an expensive mechanic to do it!
by crudmonkey December 3, 2020
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a phrase commonly used by LAA Angels' Broadcaster Victor Rojas, whenever a 3 run home run is hit by the Los Angeles Angels of Anaheim.
At the end of the game, HOWIE KENDRICK HIT A 3 RUN JIMMY JACK for a game winner!
by katierose June 7, 2010
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The act of jerking off while using a parrot instead of your hand.
The biggest problem with the Jimmy Buffet Jack is it takes me all day to pick those tangled feathers out of my pubes.
by Jimmie Buff January 27, 2007
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When a guy named James butt rapes you like there is no tomorrow
Jesus Christ he out yousing that Jimmie jack agian
by Don’t do it January 22, 2019
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This is one of the most difficult sexual positions and it's approved by Dr. Falchi as "corona safe" you are back to back doing it - you have to be very flexible.
We did the double back jimmy jack last night and my legs are killing me, I need to do more yoga.
by Vern the Man March 19, 2021
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