ZJ

ZJ may refer to:

*Zettajoule or zeptojoule, SI multiples of a joule
*The ZJ theorem, a mathematical theorem proven by George Glauberman
*The ZJ model, an automobile style used in the Jeep Grand Cherokee and the Jeep Grand Wagoneer
*An abbreviation for the Zhejiang province of China
*The act of a man receiving oral sex while being incapacitated or inebriated, popularized by the film Beerfest. The "Z" is for zombie or in a zombie like state while receiving the act. However, it is well known that if you have to ask what it means(a ZJ), you can't afford it.