Kaitocagada
Kaitocagada is when your buddy messes up a friendship without any reason and makes everything worse for everyone else. It usually happens when you've been friends for a while.
He started a fight between my crush and me. Kaitocagada!
She turned my best friend into her enemy because she was mad. Kaitocagada!
He told my crush I was a fake. Kaitocagada!