right, not had much chance to think about this, ive not been too well so here is my attempt at a definition, though i think milums is better.

minging- 1. repulsive or dirty, particularly smelly
2. disappointingly unpleasant- 'we went to that new restaurant last night, it looks lovely but it was minging'.
ming- a bad smell or rotten and damp matter
minger- an person who seems attractive but is is fact in possession of a deeply unpleasant character.
mingus- the worst you can imagine something to be