- noun an unspecified thing, thingummy, or a person whose name is forgotten or unknown. This invented word has existed at least since the 1950s.
- noun an amphetamine tablet or other pill. This is probably a narrowing of the preceding sense and was popular among the mods of the 1960s, although the plural doobs was the more common alternative. ‘Doobry’, in this drug-related sense, has also been derived from ‘double-blues’, a particular type of pep pill.