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1. adjective, slang Very exciting and vigorous, especially due to great action and speed. The film's slam-bang finale makes up for the slow start and ho-hum middle. The show turned out to be more thoughtful and introspective than slam-bang, which I think took a lot of viewers by surprise.
2. adverb, slang In a very exciting, vigorous, and action-packed manner. The play unfolds slam-bang from beginning to end, and the audience is left breathless by the end of it. The two boxers have been going at it slam-bang for the last three rounds, each one determined to knock the other out.
3. adverb, slang Very quickly, frenetically, and carelessly. The team went slam-bang for the first half of the game, but was left totally depleted as a result in the second half.
4. adverb, slang Very forcefully and noisily. The truck crashed slam-bang through the wall, bringing everyone in the area to a total standstill.
mod. wild; exciting. It was a slam-bang weekend, and I loved every minute of it.