Use 'minging' in informal settings, typically among friends or in casual conversation. Can't stay in that room, it's minging.
Pro Tip 2/3
Intensity of Disgust
'Minging' conveys strong disgust, more powerful than just saying something is bad or dirty. I can't even describe how minging that bathroom was.
Pro Tip 3/3
Avoid in Formality
Don't use 'minging' in formal or professional settings; it's too colloquial and could be seen as rude. It may be tempting, but don't call the food at the banquet 'minging'.