short for millet.

an extremely hot girl who's fantastic at kissing.

a milly is a northeren irish ruff girl normally seen wearing large fred perry jumper jogging bottoms or bright orange tracksuits to match their over fake tanned orange faces. lots of tacky large gold chains are necessary gold coin rings and overly large handbag ear-rings with their hair scraped into an extreamly tight side ponytail see also spides (the male equivlant)

Milly is Portuguese for Awesome

A northern irish female townie. The name originates from working class girls who worked in the old Mills.
see millies, millbag
Male counterpart spide

This is the word of choice for Northern Irish female chavs.
The first thing to note about a milly (or millbeg, as chavs, steeks & spides like to refer to them as) is the sports attire (shellsuits and other tracksuit-like goods are the preferred choice of clothing). Another noticable sign that you might have picked up with a milly is an orange glow to their skin and large amounts of jewellery hanging from their necks and hands. While on the subject of jewellery it is also worthwhile mentioning that they can carry rather large weighted ear-rings on their ears (this has baffled scientists for decades as to how they do this, one of lifes mysteries) A typical milly is rather heavy set and some can even look hideously disfigured, although, you may still see them pushing a pram, and believe it or not, the pram may contain a child. Generally if they're not pushing a pram they'll be heavily pregnant with one of the local hoodlums children. Sadly (or not sad enough) a milly will never end up happy with a man (choosing a chav instead who will frequently beat them in an attempt to release his frustration after a day at the betting office and local pub, knocking back pints of Stella Artois with his "Dole" money) as they tend to have rather bad tempers and do not conduct them...

A milly is a northern irish girl who wears a wide range of graments from track suites to mini shorts. Millys can be a bit chavish at times or come across as a bit of a tart. Millys normally have hir in very tight side or normal pony tail. they usually call each other my wee sexy bith or refer to each other as wee baby and pricess or smexi biach etc.