Store in a rough part of town

My wife, two daughters, and myself were driving through a dangerous part of town. I was holking at pedestrians that were just walking around in my way, then I realized I was driving down the sidewalk. We needed to stop at a store for some reason, parked the car and got out. Some young local punk kicked the side of my car. I grabbed his face, yelled at him, then pushed him away. We went into the store, selected our items, then checked out. The clerk was trying to upsell me something called, "Koi Koi", but I could not understand him. I kept asking him to repeat himself, but I could not understand. My wife whispered to me that it was a sex product, so we just left.