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 (phrasal verb)

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 break something or to cause something to become disorganized or dysfunctional.