transitive verb-·bled, -·bling
Origin of drabbleMiddle English drabelen, akin to (or from uncertain or unknown; perhaps ) Low German drabbeln, to walk in mud or water
tr. & intr.v.drab·bled, drab·bling, drab·bles
Origin of drabbleMiddle English drabelen
(third-person singular simple present drabbles, present participle drabbling, simple past and past participle drabbled)
Middle English drabelan
The "100 words" limit is the original meaning, although in practice (drabble purists have denounced this extension), it frequently extends up to around 500 words, with a variety of limits used.
From a word game in Monty Python's Big Red Book in which the first player to write a novel wins; the UK Science Fiction fandom agreed that 100 words will suffice; not, as is sometimes stated, from the surname of the author Margaret Drabble