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Noun, substantive: Can also be applied to ladies (Lady SadGeezer).

A mild instult to a fan of something (less offensive than 'sad bastard')
"Wadda sadgeezer! Why would you send me your collection of Manchester City autographs, I hate football?"

"yer a total, total, sadgeezer!"
by Al Flintoff April 06, 2006
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