Acting the mickey
Heard in Waterford and Kerry
Someone doing something that they shouldn't be doing e.g. a ref giving a bad decision at a game, a child playing with a box of matches, a garda pulling up someone for pissing in a dark alley etc.
Put down that fucking chainsaw Johnny, yer only actin de feckin mickey now.
Drop that wretched chainsaw at once Johnny, you are merely behaving like an absolute clown.