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fling off is a verb meaning "write quickly". It carries one recorded sense.
write quickly
“She dashed off a note to her husband saying she would not be home for supper”
“He scratched off a thank-you note to the hostess”
writing
Definitions, synonyms and semantic relations for fling off come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.