go moggy

Derived from the Unimog, a brand of rugged four-wheel drive trucks popular in rural areas of South Africa and Zimbabwe.

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go moggy (third-person singular simple present goes moggy, present participle going moggy, simple past went moggy, past participle gone moggy)

1. (chiefly South Africa, Zimbabwe, idiomatic, colloquial) To go without restraint; to go wild; to be adventurous.
2. (chiefly South Africa, Zimbabwe, idiomatic, colloquial) To go crazy; to be somewhat delirious.
   • 2002, Dan Wylie, Dead leaves: Two years in the Rhodesian War‎, →ISBN, page 79:

     B: "That's a bad place, I tell you, I nearly went moggy in that jungle, hey."
     A: "That's only because you got that bump on the head, when that bus ran over ..."

3. (chiefly South Africa, Zimbabwe, idiomatic, colloquial) (usually in the past tense, as in "gone moggy") To become broken, disorganized or dysfunctional.