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A person who lies as much as he shits and rarely bathes or changes clothes which allows him to maintain a highly unpleasant odor that can only be described as the Must.
"that dude that said he had a 10 inch dick was such a dunny."

"this room stinks"
"ya that dunny left the must"
by doodypie69696969 November 15, 2008
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16
Dunny, is a colloquial term for the shop 'dunelm mill', the most evil place on earth. Charcterised by its incompetent and immature staff, all of whom wear grotesque green uniforms
Lui: what are you doing tomorrow?
Vez: I'm at the Dunny
Lui: Oh that sucks!
by fold August 21, 2006
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17
Used as an insult, specifically as a synonym for 'idiot' or 'retard'.

Possibly a derivative of 'dunce'. Used in Gloucestershire, UK.
Chloe: How's work?
Amy: It was sound, but then they hired new people and they're all right dunnies. Specially this guy called Rob. He's the biggest dunny of all.
by JoeyJoeJoington February 08, 2011
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18
Being a kid who is really annoying and thinks hes cool, and says stupid "Your mom" (likes it hard up the ass) jokes.
Peter Dunn is being such a Dunny
by kidwhohatespeterdunn December 10, 2004
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19
Whenever something is dumb and funny at the same time.
Person: Hey, Clarissa, remember when we saw Discpicable Me 3?
Person 2: Haha, yes it was so dunny!!
by onlsd January 27, 2019
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20
Explosive diarrhea similar in color to Dunn Brothers Coffee.
I had a dunny today and it took five sham wows to soak it all up.
by iknowalotofwords September 15, 2009
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