Etymology
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budgie (n.)

1936, short for budgerigar.

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Definitions of budgie

budgie (n.)
small Australian parakeet usually light green with black and yellow markings in the wild but bred in many colors;
Synonyms: budgerigar / budgereegah / budgerygah / grass parakeet / lovebird / shell parakeet / Melopsittacus undulatus
From wordnet.princeton.edu