An arbitrarily defined value, usually abbreviated by a J in equations, which adjusts for errors in the process of calculation. This is generally used by physics students who are unable to achieve expected results through experimentation.
According to our data, all of the ice caps will melt in 34 days. So I threw in a little j-factor that bumped it up to 94 years.
by TalkSauce February 20, 2007

by Football September 19, 2004

by Big Dog On Campus January 9, 2010

'j-list' is an online-shop in which you can find as many japanese porn DVDs as you need to wank off for the next 300 years.
by K' December 11, 2003

Very sexy, often neotenic, usually Japanese (but can be any asian) girl. Typically dressed in miniskirts and high heels, normally seen in pictures giving the "peace" or "v" sign with their fingers.
You want to fuck them over a weekend, and then move on.
You want to fuck them over a weekend, and then move on.
by Fez Monkey June 11, 2006

A: "Yo, you should bang that chick."
B: "She's not hot at all. Kinda ugly, actually. I think I'm going to try to find another girl."
A: "Nah, nah... just cop a J."
B: "She's not hot at all. Kinda ugly, actually. I think I'm going to try to find another girl."
A: "Nah, nah... just cop a J."
by DryLee November 5, 2006
