Smashed-up can be replaced with a variety of different synonyms depending on the context. In terms of physical damage, alternatives could include "crushed", "shattered", "destroyed", "battered", or "mangled". In terms of being intoxicated, options might include "drunk", "blasted", "hammered", "wasted", or "sloshed". Alternatively, smashed-up could also be replaced with more playful or humorous terms such as "highly animated" or "wildly enthusiastic". Ultimately, the choice of synonym will depend on the precise meaning that the writer wishes to convey and the tone that they want to set.