om
noun MDMA, the recreational drug best known as ecstasy. Possibly from the Buddhist mantra 'Om', playing on the drug's association with 'trance' (a contemporary dance music genre formed on repetitive rhythms), or, perhaps, an abbreviation of
OMEGA UK, 1996
OM
noun a male; a partner; a husband. An abbreviation of 'old man'. Frequent usage by shortwave radio operators, carried over into citizens' band radio slang
US, 1976