A variation on the common term "jerk" that has become more personalized and trendy with the addition of the "o."
Similar to Lauguna Beach's "dunzo," a variation of the word "done," and "nutso," the better way of saying "nuts."
Blake ditches us for annoying girls; he's a jerko.
a jerko is a jerk but with an o like it makes it more special. basically a mean creep
Samuel is a perverted jerko!