A woman who takes offence at the smallest slight or insult, holds a grudge forever and makes life miserable for those around her. Huffbitches are frequently found in managerial positions in large companies or institutions, and cause torment and stress for anyone working for them.
The huffbitch is blocking my promotion because I borrowed her coffee cup without asking her.
Acronym standing for "Man In Grey (suit)", sometimes also given as MIGS, although this is usually used for the plural. A MIG is a stereotypical administrator - someone whose main concern is the creation and maintenance of usually pointless and obstructive rules in a large organization. Typically a MIG has little sense of humour and even less concern for the personal happiness or welfare of an organization's staff. They are usually easy to spot in places such as universities as they are the only ones wearing ties...
We're getting a visit from the quality assurance MIGs today.