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1. Very forcefully, noisily, or violently. The truck crashed slap-bang through the wall, causing chaos throughout the building. She wasn't watching where she was going and ran slap-bang into the side of her neighbor's car.
2. Precisely or directly. With a location slap-bang in the middle of the city, they're poised to become one of the trendiest shops in the area. I don't understand why they had to schedule camp slap-bang at the beginning of summer vacation. I just want a couple weeks to veg out on my own!