The word "slummed" means to spend time in a poor or run-down area, usually for the purpose of experiencing the culture or lifestyle of the residents. Synonyms for "slummed" include "roughed it," "toured," "traversed," "explored," "surveyed," "wandered," and "roamed." Other synonyms could include "ventured," "journeyed," "visited," "discovered," and "experienced." These words all suggest a type of exploration or adventure, but can also convey a sense of curiosity or even privilege in being able to access these areas. Ultimately, the synonym used will depend on the intended tone or message of the sentence or passage.