menty b

 A colloquial shortened form of mental breakdown which has the effect of making it no more than a tantrum, really.  Diminutives have that power to transform something that might be serious or threatening into something friendly, familiar and mildly humorous.  This colloquialism first appeared on Twitter and seemed to have very low frequency in Australia until it was pushed along by its inclusion in the Word of the Year list circulated by Macquarie Dictionary.  People liked it, although eventually the vote went to strollout.  Possibly with this introduction it will have more sustained use.