I hit my right thigh (under my buttock) on the tip of a brick, and it was like there was no blood going to my legs, and i am not walking properly (normally). so what's wrong ?

Be seen if still sx: It sounds like you may have bumped your sciatic nerve, which runs through your buttocks. It would give you symptoms like you get when you bump the "funny bone" in your elbow - tingling where the nerve travels. But, like hitting your funny bone, it should be temporary. If you still have symptoms, you should see a doctor and be examined.