1. someone who smells bad
2. an ugly person (used of people to whom your attention has been drawn by a friend, perversely as a potential mate.)
3. someone who has very recently been drunk. Cognate of rat-arsed.
NB: This description should not be used to describe someone as drunk, as you will probably be drunk yourself.
4. someone generally distasteful
This word is widely used in the North of England and Scotland.
"No I don't fancy him, he's a complete minger!"
"You minger! You were completely rat-arsed last night!"
"Bouche and his cronies are complete mingers!"
Now often used by chavs all over Britain to define anything remotely disgusting
It comes from the Scots word "ming", which refers to several things, such as something smelly, poor quality, unattractive, and also to human excrement, the latter definition documented by Watson in the early 1900s around Roxburgh.
The word minger was picked up by Big Brother's Jade Goody to describe herself on national TV in 2002 and quickly spread around English youth culture, all blissfully unaware of it's correct meaning and true origin - as shown by the wrong entries in this section.