To overtake, bypass, or superceed another individual through means of force, skill, or trickery with great deals of confidence.
Also, to take or steal an object or idea from another individual with swift hand or intellectual movements.
My mother, Lisa Michelle O'Brien, expertly joinked the spoon out of my my hand during my ill-advised attempt at stealing the last bite of ice cream from her bowl.
A variant of the word owned, where the J is simply added in front of "owned" (the J is used when trying to imitate a Jamaican). Mostly used in video games.
"Hey Sam, guess what? I just Jowned that guy in the jeep with my zero! He never knew what hit him."