ButaccordingtoEmilyBrewer, a senioreditorattheMerriam-WebsterDictionary, “lit” hasbeenusedasslangsincetheearly 1900s as a waytodescribesomeoneundertheinfluence.
Intheearly 20thcentury, westartedtoseetheword “lit” usedas a slangwordthatmeantdrunk.
If a musicianuses a wordin a particularway, thenthepeoplewhoknowthatmusicthenlearnthatnewuseofthatword, andcreates a culturearoundthatmusicandthatparticularuse.