That kick's called "Neeb" and is actually a dud. It does hurt when hit with but still if you uppercut someone in that area he'll be down especially if done on women.
"Neeb" is considered as irrating technique used by many boxers who are not very popular. Just throw the neeb every now and then after a while, your opponent is gonna get real mad and just swing at you. That's when you sway and finish him off. Many boxers have been boo'ed at for using this technique and judges think twice before giving points for this technique.
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This can cause internal injury and is particularly effective therefore in disabling someone on the street/in a pub etc.
I doubt it. Tried it on a friend, he got mad, that's all. I didn't see any disabling effect. And remember, on the street if you have adrelarine, you won't probably feel this move until after the fight when your abdomen is all sore.
-Taison out 