moviedude's definitions
Person who is kind & wholesome until pushed over the line. Reference to baby JackJack from "The Incredibles" Movie.
Don't keep pushing him. He's going to go Jack-Jack.
Be careful with him. He's got a Jack-Jack personality
Be careful with him. He's got a Jack-Jack personality
by moviedude March 9, 2008
Get the jack-jackmug.