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1.
Misery guts: abbreviation of 'miserable fizzog' (fizzog meaning 'face': see 'Fizzog'). Often further abbreviated to 'mis' or 'miz'.
Mona was her usual pissed off mizzog self!
by Toody Oakhill August 29, 2007
 
2.
a misery guts

I thought I was the only person on the planet that used this word.. thought it was made up by myself .. obviously not though .
He was a right Happy Harry . >> miserable old git.

Don't be such a mizzog, join in the fun
by Wendinthewillows March 10, 2011