go moggy

(chiefly South Africa, Zimbabwe, idiomatic, colloquial) To go without restraint; to go wild; to be adventurous.

(chiefly South Africa, Zimbabwe, idiomatic, colloquial) To go crazy; to be somewhat delirious.

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