a question about fighting

There is one technique which I couldn't yet use, but a friend of mine recommended to me. You just take some good momentum with both of your arms and then slap the enemy with open palms on the ears from both sides simultaneously.

Now, in theory, that should work like a flashbang grenade, that is that it should liquify the liquid that is in your ears which is responsible for your motor controls and balance, that is, it gets disturbed and the enemy should be a bit disoriented and hard on his feet.

Does anybody know if this works and what the name of this technique is?

also wanted to add why the flash bang effect is fiesable.
when hit on both ears with a cupped hands, the pocket of air damages the eardrums, and when hit hard enough it will also effect the balancing funtions of your body, which are right behind the ears.