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1.
someone who is a filthy minger. or someone who is nasty and vile or disgusting.
"That bloke just sneezed on his hand and licked it - what a fucking mingbag."
by bee December 08, 2004
 
2.
someone, usually a girl, who is very ugly.
derived from "Minger" (ugly person/girl).
Joane is an absolute ming bag.
by Kool_Dude_HaMeR March 09, 2007