wat he said ^ it is litterally just a play on wordsIt is the jutsu carried out by the plot.
Seriously, it means "by plot."
For example - "Tobirama would have killed the 20 fodder ninja but if not for plot."
Can be rewritten as
"Tobirama would have killed the 20 fodder ninja if not for plot-no-jutsu"
We just use the term because it is more suitable for Naruto-fans. U_U