Minging/Minger

A UK derogatory term, that can be applied to anything that is regarded as being dirty, drunk, disgusting or ugly.

• Minger - An unattractive person (usually female)
  
• Minging - drunk, painful, disgusting (can be used to describe place, event or person [including yourself])
  

Origins:

Ming (early 1800s) was used in Scotland as describing both human excrement and the ingredients compounded with or substituting tar in sheep-smearing.

In the 1970's ming (in Scotland) was used as slang for "a bad smell" in particular associated with drunkenness.

This eventually evolved into anything that was dirty, and was incorporated within the British Army (believed to be through both Scottish troops and training bases in Scotland), with :

Your boots are minging,

your plumes in shite,

Your balls are swinging from left to right...."
It wasn't until the late 1990's (some report usage in 1999) that the term ming and it's variations were introduced to mainstream society.

References:

• London Slang
  
• Urban dictionary: minging
  
• BBC History
  
• Oxford English Dictionary - minger
  
• Dictionary of the Scots Language