a dude who is always lifting big things.

when alcohol becomes involved don't go near bro, he will fight u

loves a romp
claims an amateur mui tai fighter would beat Mike Tyson
damn bro is at the gym, he is a total jack jack !!
by kinglegend69 August 23, 2022
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A Product made from mixing a bowl of "Apple Jacks" with a can of "coke." This is said to have great effects on your body and increase your testosterone level and get you JACKED.
"Man I love my Jacked-Jacks"

Before using Jacked-Jacks: "I can't lift this church!"

After using Jacked-Jacks: " I CAN LIFT THIS CHURCH!!"

by Anthony Monty May 8, 2007
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a sneaky little person that works at cybercamps, and is constantly bugging owen about him being an LIT. he wears a stuipd pink ballon around his head, which has headlice.
by odubcybercamps August 4, 2009
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A person that is addicted to starbucks and/or usually calls great people "chu chu"
Someone:That person is so jack jack
by asdfasdfasdf October 9, 2006
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A baby who is white that beats the crap out of the racoon and has so many powers
by By alien 👽club July 26, 2018
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When numerous persons with the name of Jack gather and compete over who can pleasure themselves the best, most efficiently, or fastest. Any other competition parameter works under this term, but it must pertain to multiple Jacks masturbating.
"Hey homie, did you attend the Jack jack off off last night?"

"Yeah man! Jack was on fire, but other Jack finished in record time. I couldn't believe my eyes!"
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