There are many synonyms that can be used in place of the term "frommed abusing a substance black out". Some common synonyms for this phrase include "intoxicated blackout", "substance-induced blackout", and "drug-induced amnesia". Other synonyms include "loss of consciousness due to substance abuse", "drug-induced coma", and "inebriated unconsciousness". Depending on the specific context, there may be additional synonyms that are more appropriate. However, it's important to note that substance abuse and blackouts can be dangerous and harmful, and individuals who experience these symptoms should seek professional help immediately.