RTD (acronym) Type: noun, acronym, slang Pronunciation: /r-t-d/ Also spelled: R.T.D., R-T-D What does RTD mean and stand for? 1. Rough, tough, and dangerous. 2. Rapid Transit District; A public bus in Los Angeles County where robberies occur. RTD Synonyms: R.T.D. Example sentence: “He took the ride home on the RTD.” RTD in songs: “When […]