A hybrid of misery and hog. The connection of suggesting someone is a miserable pig, is fairly obvious. Although, it is used in a more light hearted and friendly manner, either as a gentle rebuke, or to refer to someone's demeanour, or attitude, rather than an insult.
To someone who is unjustifiable whinging or moaning..."Come on cheer up, don't be such a mishog"
Or
Online about the resident troll. "I see, that Jack's being his normal mishog self"
Verb. To mizoogle something, to ask someone something that you could easily find out yourself by using the Google search engine.
Derived from the common practice among Mizan's friends of asking him for information rather than just googling it; has since evolved to include anyone being badgered for information (and not just Mizan).
Sure, I *could* research which members of Congress are into bestiality myself; but why google something when you can mizoogle it?