ka-backhand
You swing your hand like you’re about to fight a dragon and then hit someone with the back of your hand, yell KA-BACKHAAAND, and think you’re some kind of hero.
I ka-backhanded my neighbor when he yelled at my dog.
I ka-backhanded my friend because he wouldn’t stop teasing me.
I ka-backhanded my mom when she said I was lazy.