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1.
Scottish - Someone or somethings that is very smelly
That house was really hum dinging.
My t-shirt is pure hum dinging because iam sweaty
by Gayley August 19, 2006
 
2.
something that is bad, by smell, taste or look. rhyming slang for minging.
"yuk! dave have you farted that smells toatlly hum-dinging "
by ant1y February 08, 2008
 
3.
Smelling bad
That is one humdinging fart; I am humdinging after that soccer match
by Skillage09 October 18, 2010