Kakashi isn't funny.

[davidou]

It had be hilarius and useful if jutsu was combined with chidori. Lightning enters from anus and fries up all organs.
It would have sent fear across enemies.
"A shinobi has died after taking devastating blow in the anus. He was moving carefully avoiding minefields but suddenly Kakashi Hatake appeared behind, he could not cover up his ass in time"
"Every one cover your asses Kakashi has been spotted in front line"

It would be counterable by another joke no jutsu, as you know wind>lighting.
A fart no jutsu would easily cancel Kakashi's 1000 chidoris of pain.

It would be"Kakashi is here, prepare your farts"