additional to the previous definitions: australia (and new zealand) are sheep-farming countries and our populations are familiar with many of the aspects of farming livestock. a "dag" or "dags" is the colloquial term for the dung which collects and mats into the fleece immediately surrounding a sheep's anus; it hangs in dried-out dangling clumps which make a sound when the sheep runs, hence the phrase "rattle your dags". a sheep should be "ring crutched" to avoid or relieve this condition: crutching is the removal by shearing of all fleece surrounding the genitals usually in a circular shape or ring. a sheep not cared for properly in this way will otherwise collect dags - hence the possible connection to insults concerning fashion and appearance. the sight of a daggy sheep is unattractive and comical, although the mats of contaminated fleece may be painful and usually attract blowflies and other pests; and therefore to call someone "daggy" is to liken them directly to a neglected sheep's anal region suffering from this condition.

A pick me is a woman that is willing to do anything for male approval. She will embarrass or throw other women under the bus to achieve this goal. The unfortunate thing about a pick me is usually the men they are trying to seek approval from are of poor quality and treat women badly, leaving little real benefit for the pick me.

Australian origin.
adj. not stylish, out of fashion, not trendy, not cool, untidy, unclean, not neat.
v. to have no style.

The opposite of trendy. Uncool, in an unfashionable sense. Think so last season, or old fashioned. Applies to people and things, not just fashion. Not particularly insulting; can even have friendly undertones.

This actually refers to farming... A dag is what happens when a sheep (or any farm animal with long hair) craps and the crap gets stuck in the hair, thus forming a dag.
To call someone Daggy, is to call them dirty/messy/hair full of crap.

Term used in Australia to describe "Granny Panties" or old worn out, ugly panties.

A Daggy is a person who nails everything at first try.