We found 3 dictionaries that define the word like a blue arsed fly:

General (2 matching dictionaries)

1. like a blue-arsed fly, like a blue-arsed fly: Collins English Dictionary
2. like a blue-arsed fly: Wiktionary

Slang (1 matching dictionary)

3. like a blue arsed fly: English slang and colloquialisms used in the United Kingdom

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