Meaning of “go walkabout” in the English Dictionary

british dictionary

"go walkabout" in British English

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go walkabout

informal humorous

If you say that an object has gone walkabout you mean that it is missing, often because someone has taken it:

My pen was here this morning but it seems to have gone walkabout.

(Definition of “go walkabout” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)