Mid 17th century. Origin uncertain. Although the word is evidently related to its slightly later synonyms rum and rumbustion, the precise nature of the relationship in unclear.
rumbullion2
/rʌmˈbʊlɪən/
Now historical and rare
noun
A variety of gooseberry with yellow or green skin, used chiefly for bottling.
Origin
Late 17th century (in an earlier sense). Alteration of Rambouillet.